{"title":"O-Rings \u0026 Gasket Sets","description":null,"products":[{"product_id":"evinrude-johnson-air-box-gasket-mpn-118-0140-outboard-gasket","title":"Sierra Air Box Gasket 18-0140 for Evinrude Outboard Engines","description":"\u003cp\u003eThe Sierra 18-0140 Air Box Gasket is a replacement seal designed for Evinrude outboard engines, sold as part of Sierra's outboard gasket set lineup. It is installed between the air box housing and the engine intake to maintain a proper seal, preventing unmetered air, dirt, and moisture from entering the intake tract and disrupting the air\/fuel mixture. A worn, cracked, or compressed air box gasket can cause a rough idle, hesitation, or an inconsistent fuel mixture, so replacing it during routine maintenance or when servicing the air box helps restore a proper seal.\u003c\/p\u003e\u003cp\u003eThis gasket is lightweight at 0.03 pounds and is identified by UPC 030999751102 and Sierra part number 18-0140. It is intended as a direct-fit replacement for the factory air box gasket on applicable Evinrude outboard engines, making it a straightforward maintenance item to keep on hand for outboard servicing.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0140\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Air Box Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Evinrude Outboard Engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999751102\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits applicable Evinrude outboard engines. Confirm compatibility with your engine's air box before ordering.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003eNo OEM cross-reference numbers are specified for this part.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0140 air box gasket fit?\u003c\/strong\u003e The 18-0140 is designed for Evinrude outboard engines and is meant to be installed as a seal between the air box housing and the engine intake.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0140 a genuine Sierra part number?\u003c\/strong\u003e Yes, 18-0140 is the Sierra manufacturer part number for this air box gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket weigh?\u003c\/strong\u003e The 18-0140 air box gasket weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this part?\u003c\/strong\u003e The UPC for the Sierra 18-0140 air box gasket is 030999751102.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the air box gasket installed?\u003c\/strong\u003e It seals the joint between the air box housing and the intake on the outboard engine, preventing unmetered air, dirt, and moisture from entering the intake.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the symptoms of a failing air box gasket?\u003c\/strong\u003e A cracked or compressed air box gasket like the 18-0140 can allow unmetered air into the intake, which may cause a rough idle, hesitation, or an inconsistent air\/fuel mixture.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre OEM cross-reference numbers available for this gasket?\u003c\/strong\u003e No OEM cross-reference numbers are listed for the Sierra 18-0140 air box gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this gasket sold individually or as part of a set?\u003c\/strong\u003e The 18-0140 is offered as an individual air box gasket within Sierra's outboard gasket set category.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the air box gasket?\u003c\/strong\u003e Replace the 18-0140 air box gasket any time the gasket is visibly worn, cracked, or compressed, or when servicing the air box on an Evinrude outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket require any special tools to install?\u003c\/strong\u003e The 18-0140 is a standard flat gasket that is installed by removing the air box housing and fitting the new gasket in place of the old one.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988025323739,"sku":"SIE-18-0140","price":2.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0140_lg__78072.1558119612.500.750.jpg?v=1785329149"},{"product_id":"bypass-gasket-for-chrysler-force-outboard-100-140-hp-replaces-oem-27-f85762-2-pack-mpn-118-0141-9","title":"Sierra Bypass Gasket 18-0141-9, 2-Pack, Force Outboard Powerhead Gasket","description":"\u003cp\u003eThe Sierra 18-0141-9 bypass gasket is a powerhead gasket engineered for Force outboard engines, sold as a 2-pack so a spare is always on hand for the next service interval. Bypass gaskets like this one seal the bypass passage on the powerhead, helping maintain proper sealing between mating surfaces during engine operation. Each pack is lightweight at just 0.01 pounds, reflecting its role as a precision-cut sealing component rather than a bulky assembly. Ordering the correct Sierra part number ensures the gasket matches the dimensions and bolt pattern of the original equipment it is designed to seal, which is important for preventing leaks and maintaining compression or fluid pathways within the powerhead. Because it ships two to a pack, boat owners and marine technicians can complete a full gasket replacement or keep a spare on the shelf without ordering twice. This gasket is cataloged under Sierra's Force Outboard Powerhead Gaskets line, making it easy to identify alongside other powerhead sealing components for the same engine family.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0141-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Category:\u003c\/strong\u003e Force Outboard Powerhead Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets per pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282161408\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a Sierra 18-0141-9 pack?\u003c\/strong\u003e Two bypass gaskets ship in every pack of Sierra part number 18-0141-9, so a spare is included with each order.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0141-9 used for?\u003c\/strong\u003e It is a bypass gasket for the powerhead of Force outboard engines, used to seal the bypass passage during engine operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0141-9 bypass gasket weigh?\u003c\/strong\u003e 0.01 pounds per pack, reflecting its size as a thin, precision-cut sealing gasket rather than a bulky part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category does this gasket fall under?\u003c\/strong\u003e Sierra catalogs the 18-0141-9 under its Force Outboard Powerhead Gaskets line.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0141-9 sold individually or in a pack?\u003c\/strong\u003e It is sold per 2-pack, not as a single gasket, under Sierra part number 18-0141-9.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0141-9 gasket?\u003c\/strong\u003e 808282161408 is the UPC associated with the Sierra 18-0141-9 bypass gasket 2-pack.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-0141-9 a genuine Sierra Marine part number?\u003c\/strong\u003e Yes, 18-0141-9 is the Sierra part number for this bypass gasket, identifying it within Sierra's Force outboard powerhead gasket lineup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I replace both gaskets at once when servicing the powerhead?\u003c\/strong\u003e Since the Sierra 18-0141-9 ships as a 2-pack, both gaskets are available in a single order, making it convenient to replace them together during a service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0141-9 include installation hardware?\u003c\/strong\u003e The pack contains the bypass gaskets themselves (two per pack); no additional hardware is specified for this part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy order a spare Sierra 18-0141-9 gasket?\u003c\/strong\u003e Because bypass gaskets are used during powerhead service and can be damaged during removal, having the second gasket from the 2-pack on hand avoids a delay in completing the job.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988026732763,"sku":"SIE-18-0141-9","price":1.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0141_lg__13581.1558119741.500.750.jpg?v=1785329152"},{"product_id":"sierra-18-0184-rubber-ring-for-volvo-penta-reverse-tilt-lock-replaces-804190-fits-sp-a-dp-a-aq250-290-sterndrives","title":"Sierra Rubber Ring 18-0184, Replaces 804190, Clamp Ring Seal for Volvo Penta SP-A\/DP-A\/DP-B Drives and AQ Series Engines","description":"\u003cp\u003eThe Sierra Rubber Ring, part number 18-0184, is a clamp ring seal used on Volvo Penta sterndrive units and inboard engines. It is a direct replacement for OEM number 804190, allowing it to be installed anywhere that original ring was specified without modification. The ring is made of white rubber, shaped to seat against the clamp ring where the drive leg joins the transom assembly or where the engine-side clamp ring is fitted, helping maintain a sealed connection at that joint.\u003c\/p\u003e\u003cp\u003eThis ring fits Volvo Penta drive legs including 275A, 280, 280DP, 280L, 285A, 290, 290A, 290DP, SP-A, SP-A\/MT, SP-A1, SP-A2, DP-A, DP-A1, DP-A2, DP-B, and DP-B1. The same clamp ring design is also used on a wide range of AQ-series engines, so 18-0184 additionally fits 230A\/SP-A\/MT, 250A\/SP-A\/MT, 500A, 501A, 571A, 740A, AQ100, AQ105, AQ110, AQ115A, AQ110B, AQ120A, AQ120B, AQ125A\/B, AQ130A\/B, AQ131A\/D, AQ175A, AQ190A, AQ200A\/C\/D\/F, AQ210A, AQ211A, AQ225A\/B\/C\/D\/E\/F, AQ231A\/B, AQ240A, AQ255A\/B, AQ260A\/B, AQ271A\/B\/C\/D, AQ280A, AQ290A, AQ311A\/B, AQ60F, AQ80, AQ90, AQ95, AQD19, AQD29\/A, and AQD32A. Each unit ships as a single ring weighing 0.57 pounds. Confirm your drive or engine model against this fitment list before ordering, since Sierra also offers a separate rubber ring, 18-8368, for a different clamp ring range.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0184\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Rubber Ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.57 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 ring per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282188641\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 804190\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVolvo Penta drive legs: 275A, 280, 280DP, 280L, 285A, 290, 290A, 290DP, SP-A, SP-A\/MT, SP-A1, SP-A2, DP-A, DP-A1, DP-A2, DP-B, DP-B1\u003c\/li\u003e\n\u003cli\u003eClamp ring fits: 230A\/SP-A\/MT, 250A\/SP-A\/MT, 500A, 501A, 571A, 740A, AQ100, AQ105, AQ110, AQ115A, AQ110B, AQ120A, AQ120B, AQ125A\/B, AQ130A\/B, AQ131A\/D, AQ175A, AQ190A, AQ200A\/C\/D\/F, AQ210A, AQ211A, AQ225A\/B\/C\/D\/E\/F, AQ231A\/B, AQ240A, AQ255A\/B, AQ260A\/B, AQ271A\/B\/C\/D, AQ280A, AQ290A, AQ311A\/B, AQ60F, AQ80, AQ90, AQ95, AQD19, AQD29\/A, AQD32A\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e804190\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does Sierra Rubber Ring 18-0184 replace?\u003c\/strong\u003e Part number 18-0184 replaces OEM number 804190, so it installs as a direct equivalent anywhere that original clamp ring seal was specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Volvo Penta drive legs use this clamp ring?\u003c\/strong\u003e The 18-0184 rubber ring fits clamp rings on 275A, 280, 280DP, 280L, 285A, 290, 290A, and 290DP drive legs, as well as SP-A, SP-A\/MT, SP-A1, SP-A2, DP-A, DP-A1, DP-A2, DP-B, and DP-B1 legs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0184 ring fit engines as well as drive legs?\u003c\/strong\u003e Yes, the clamp ring sealed by this ring also fits AQ-series engines including AQ100, AQ105, AQ110, AQ115A, AQ110B, AQ120A\/B, AQ125A\/B, AQ130A\/B, AQ131A\/D, AQ175A, AQ190A, AQ200A\/C\/D\/F, AQ210A, AQ211A, AQ225A\/B\/C\/D\/E\/F, AQ231A\/B, AQ240A, AQ255A\/B, AQ260A\/B, AQ271A\/B\/C\/D, AQ280A, AQ290A, and AQ311A\/B, plus 230A\/SP-A\/MT, 250A\/SP-A\/MT, 500A, 501A, 571A, 740A, AQ60F, AQ80, AQ90, AQ95, AQD19, AQD29\/A, and AQD32A.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-0184 ring made of?\u003c\/strong\u003e It is a rubber ring, sized to seat against the clamp ring on compatible Volvo Penta drive legs and AQ-series engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0184 rubber ring?\u003c\/strong\u003e The 18-0184 rubber ring is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does part number 18-0184 weigh?\u003c\/strong\u003e The Sierra 18-0184 rubber ring weighs 0.57 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many rings are included when ordering 18-0184?\u003c\/strong\u003e Each package of Sierra part 18-0184 contains one rubber ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0184 a genuine Sierra part or a generic aftermarket seal?\u003c\/strong\u003e 18-0184 is a Sierra-branded rubber ring engineered to replace OEM number 804190, rather than a generic universal seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between Sierra 18-0184 and 18-8368?\u003c\/strong\u003e Sierra 18-0184 replaces OEM 804190 and fits clamp rings on 275A\/280\/290-series drive legs and AQ100 through AQ311A\/B engines, while Sierra 18-8368 is a separate rubber ring that replaces OEM 813967 and fits a different clamp ring range including 230A\/SP-A\/SP A1, 230B, 250A\/B, 251A, 430A\/B, 431A\/B, 432A, 434A, 500B, 501B, 570A, and 572A. Match your drive or engine model to the correct part before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm 18-0184 is the correct ring for my drive or engine?\u003c\/strong\u003e Check your model against the 18-0184 fitment list, which covers 275A, 280, 280DP, 280L, 285A, 290, 290A, 290DP, SP-A, SP-A\/MT, SP-A1, SP-A2, DP-A, DP-A1, DP-A2, DP-B, DP-B1, and the AQ-series engines listed for its clamp ring; if your model is not on that list, a different Sierra rubber ring such as 18-8368 may be the correct part instead.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988055240923,"sku":"SIE-18-0184","price":35.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0184_lg__99246.1558118790.500.750.jpg?v=1785188306"},{"product_id":"marine-engine-washer-92990-10600-00-for-yamaha-225-hp-outboard-1992-1993-1997-sierra-18-0192","title":"Sierra Washer 18-0192, Replaces Yamaha 92901-10600-00, 92902-10600-00, 92903-10600-00","description":"\u003cp\u003eThe Sierra 18-0192 is a marine engine washer designed as a direct replacement for the Yamaha OEM washers listed below. It is used during outboard engine service and reassembly to provide a proper seating surface at fastener and fitting points, helping maintain a secure, even fit where these Yamaha OEM washers are called for. Priced and sold per piece, it is a small but important part to have on hand for engine maintenance and repair jobs.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0192\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Engine Parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282291839\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold As:\u003c\/strong\u003e Priced per piece\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eDesigned to fit applications using Yamaha OEM washers 92901-10600-00, 92902-10600-00, and 92903-10600-00\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eYamaha 92901-10600-00\u003c\/li\u003e\n\u003cli\u003eYamaha 92902-10600-00\u003c\/li\u003e\n\u003cli\u003eYamaha 92903-10600-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0192 washer used for?\u003c\/strong\u003e The Sierra 18-0192 is an engine washer used during outboard engine service and reassembly at points where the corresponding Yamaha OEM washer is specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Yamaha OEM part numbers does the Sierra 18-0192 replace?\u003c\/strong\u003e It replaces three Yamaha OEM numbers: 92901-10600-00, 92902-10600-00, and 92903-10600-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0192 a genuine Yamaha part or an aftermarket replacement?\u003c\/strong\u003e The 18-0192 is a Sierra-branded aftermarket washer manufactured to replace the Yamaha OEM washers 92901-10600-00, 92902-10600-00, and 92903-10600-00, not a Yamaha-branded original part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0192 washer weigh?\u003c\/strong\u003e This washer weighs 0.15 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0192 sold individually or in a set?\u003c\/strong\u003e The 18-0192 washer is priced and sold per piece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill one Sierra 18-0192 washer work in place of any of the three listed Yamaha numbers?\u003c\/strong\u003e Yes, the Sierra 18-0192 is a single part that cross-references to all three Yamaha OEM numbers: 92901-10600-00, 92902-10600-00, and 92903-10600-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of part is the Sierra 18-0192?\u003c\/strong\u003e The 18-0192 is classified as an engine parts item, specifically a washer used in outboard engine assemblies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need the Sierra 18-0192 washer for my engine?\u003c\/strong\u003e If your Yamaha engine calls for OEM washer 92901-10600-00, 92902-10600-00, or 92903-10600-00, the Sierra 18-0192 is the matching replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0192 come with any other hardware?\u003c\/strong\u003e The 18-0192 listing is for the washer only, priced per piece, with no additional hardware included.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988056715483,"sku":"SIE-18-0192","price":0.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0192__32942.1558184442.500.750.jpg?v=1785329190"},{"product_id":"sierra-18-0232-cover-gasket-replaces-mercury-27-703351-fits-3-cylinder-outboards-package-of-2","title":"Sierra Cover Gasket 18-0232 for Yamaha Outboard Engines, Replaces 27-81031M","description":"\u003cp\u003eThe Sierra 18-0232 is a cover gasket built for Yamaha outboard engines. It seals the mating surface between the engine cover and the block, preventing oil, coolant, or air leaks at that joint and helping the covered components run reliably. As a direct-fit replacement, it is engineered to match the exact profile and thickness of the original equipment gasket it replaces, so it installs without modification and restores a proper seal after the old gasket has hardened, torn, or compressed with age.\u003c\/p\u003e\u003cp\u003eThis gasket is manufactured by Sierra, a long-established supplier of marine engine parts, and is cross-referenced to the OEM Yamaha part number it replaces. It ships as a single gasket and is lightweight at just 0.01 pounds, reflecting its thin, flat construction typical of cover gaskets. Because gaskets are wear items that lose their sealing ability once removed or over time, keeping a replacement like the 18-0232 on hand makes routine cover maintenance straightforward.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0232\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Cover Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Yamaha outboard engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 27-81031M\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999973788\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999973788\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Yamaha outboard engines.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003e27-81031M\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0232 cover gasket fit?\u003c\/strong\u003e The Sierra 18-0232 cover gasket is designed for Yamaha outboard engines and installs in place of the original cover gasket without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0232 replace OEM part 27-81031M?\u003c\/strong\u003e Yes, the Sierra 18-0232 is a direct replacement for OEM Yamaha part 27-81031M and is built to the same fit and seal profile.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0232 cover gasket weigh?\u003c\/strong\u003e The Sierra 18-0232 cover gasket weighs 0.01 pounds, consistent with its thin, flat gasket construction.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0232 sold as a single gasket or in a multi-pack?\u003c\/strong\u003e The Sierra 18-0232 is sold as a single cover gasket, with one item per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0232 cover gasket?\u003c\/strong\u003e The UPC for the Sierra 18-0232 cover gasket is 030999973788, with a corresponding GTIN of 00030999973788.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does a cover gasket like the 18-0232 actually do?\u003c\/strong\u003e A cover gasket seals the joint between an engine cover and the block it mounts to, preventing leaks at that surface; the 18-0232 performs this function on applicable Yamaha outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0232 an OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-0232 is a Sierra aftermarket gasket manufactured to replace OEM Yamaha part 27-81031M, not an OEM-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the 18-0232 cover gasket be replaced?\u003c\/strong\u003e A cover gasket such as the 18-0232 should be replaced any time the cover it seals is removed, or if it shows signs of hardening, tearing, or leaking.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-0232 gasket be reused after removal?\u003c\/strong\u003e No, cover gaskets including the 18-0232 are designed for one-time use and should be replaced with a new gasket any time the cover is taken off.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the package with the Sierra 18-0232?\u003c\/strong\u003e The package contains one Sierra 18-0232 cover gasket and no additional hardware or components.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988059730139,"sku":"SIE-18-0232","price":1.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0232_lg__04249.1558118069.500.750.jpg?v=1785188635"},{"product_id":"sierra-18-0320-reed-block-gasket-for-mercury-outboards-replaces-mercury-27-13937-27-139374","title":"Sierra 18-0320 Reed Block Gasket - Cross Reference Mercury 27-13937","description":"\u003cp\u003eThe Sierra 18-0320 is a reed block gasket built for outboard engine service, sealing the mating surface between the reed valve block and the powerhead to maintain proper crankcase compression and prevent air or fuel leaks at the joint. It is manufactured from a glass-based gasket material designed to hold a consistent seal under the heat cycling and vibration typical of outboard operation. Each Sierra gasket is engineered to meet or exceed the quality of the original equipment part it replaces, making it a straightforward direct-fit replacement during a reed block rebuild, powerhead service, or routine maintenance. The 18-0320 is a single-piece gasket supplied as one unit, sized to match the reed block gasket used across a range of Mercury outboard applications that call for this specific part. Because it corresponds to several historical OEM and aftermarket part numbers, it is commonly sourced as a replacement whenever an older reference number is found stamped on the block or listed in a parts diagram. Installers should confirm the old gasket's dimensions and bolt pattern against the 18-0320 before ordering, and always install a new gasket rather than reusing the old one to ensure a proper seal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0320\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Reed Block Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Glass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Multi-coloured\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999873101\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e GLM 32220, Mallory 9-60061, Mercury 27-13937-6, 27-139374, 27-139372, 27-13937\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 32220\u003c\/li\u003e\n\u003cli\u003eMallory 9-60061\u003c\/li\u003e\n\u003cli\u003eMercury 27-13937-6\u003c\/li\u003e\n\u003cli\u003eMercury 27-139374\u003c\/li\u003e\n\u003cli\u003eMercury 27-139372\u003c\/li\u003e\n\u003cli\u003eMercury 27-13937\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0320 used for?\u003c\/strong\u003e The Sierra 18-0320 is a reed block gasket that seals the joint between the reed valve block and the powerhead on applicable outboard engines, maintaining proper crankcase sealing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0320 gasket the same as Mercury 27-13937?\u003c\/strong\u003e Yes, the Sierra 18-0320 Reed Block Gasket is a direct cross-reference for Mercury 27-13937, 27-13937-6, 27-139374, and 27-139372, along with GLM 32220 and Mallory 9-60061.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-0320 reed block gasket made from?\u003c\/strong\u003e It is made from a glass-based gasket material designed to hold a consistent seal under engine heat and vibration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets are included with part number 18-0320?\u003c\/strong\u003e One reed block gasket is included per unit count for the Sierra 18-0320.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0320 gasket weigh?\u003c\/strong\u003e It weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0320 meet original equipment quality?\u003c\/strong\u003e Sierra states this gasket meets or exceeds the quality of the original equipment part it replaces, making the 18-0320 a reliable equivalent to OEM.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reuse my old reed block gasket instead of installing the 18-0320?\u003c\/strong\u003e No, a gasket should not be reused once removed; installing a new Sierra 18-0320 ensures a proper seal at the reed block joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-0320 gasket?\u003c\/strong\u003e The gasket has a multi-coloured appearance, consistent with its glass-based gasket material.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0320 an aftermarket or genuine Mercury part?\u003c\/strong\u003e The 18-0320 is a Sierra-brand aftermarket gasket engineered as a cross-reference equivalent to the Mercury 27-13937 series parts, not a Mercury-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0320 reed block gasket?\u003c\/strong\u003e The UPC is 030999873101.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988062777563,"sku":"SIE-18-0320","price":3.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0320_lg__55148.1637358372.500.750.jpg?v=1785188626"},{"product_id":"sierra-18-0334-mounting-plate-to-driveshaft-housing-gasket-for-mercury-outboards-replaces-27-39402","title":"Sierra Mounting Plate to Driveshaft Housing Gasket 18-0334 for Mercury Outboards","description":"\u003cp\u003eThe Sierra 18-0334 is a mounting plate to driveshaft housing gasket designed for Mercury outboard motor applications. This gasket seats between the mounting plate and the driveshaft housing to form a tight, reliable seal at that joint, helping keep water out and lubricants in as the lower unit assembly operates. Replacing a worn, cracked, or compressed gasket at this location during a lower unit rebuild, driveshaft housing removal, or general maintenance service helps restore the original factory seal and prevents water intrusion that can lead to corrosion or gearcase damage over time.\u003c\/p\u003e\u003cp\u003eSierra manufactures this gasket to match the fit and function of the original equipment part it replaces, making it a straightforward drop-in choice when servicing the mounting plate and driveshaft housing area on a Mercury outboard. The part ships as a single gasket, part number 18-0334, and is sold individually for one repair.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0334\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Mounting Plate to Driveshaft Housing Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.09 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 gasket per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999873231\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury outboard motors (mounting plate to driveshaft housing joint)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0334 gasket used for?\u003c\/strong\u003e The Sierra 18-0334 is a mounting plate to driveshaft housing gasket that seals the joint between the mounting plate and the driveshaft housing on a Mercury outboard motor, helping prevent water intrusion at that connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket fit Mercury outboards?\u003c\/strong\u003e Yes, part number 18-0334 is designed for the mounting plate to driveshaft housing joint on Mercury outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package?\u003c\/strong\u003e One Sierra 18-0334 gasket is included per package, sold individually for a single repair or rebuild.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0334 gasket weigh?\u003c\/strong\u003e The Sierra 18-0334 mounting plate to driveshaft housing gasket weighs 0.09 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-0334 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e 18-0334 is manufactured by Sierra as a replacement part designed to match the fit and function of the original mounting plate to driveshaft housing gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this gasket?\u003c\/strong\u003e This gasket should be replaced any time the mounting plate or driveshaft housing is removed for service, or if the existing gasket is torn, cracked, or compressed and no longer sealing properly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if this gasket fails or is left out during reassembly?\u003c\/strong\u003e A failed or missing gasket at the mounting plate to driveshaft housing joint can allow water to enter the lower unit area, which can lead to corrosion or damage to internal components over time.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this gasket be reused after removal?\u003c\/strong\u003e Gaskets like the Sierra 18-0334 are designed for one-time use; once the mounting plate or driveshaft housing has been separated, installing a new gasket such as this one is recommended to maintain a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-0334 gasket made from?\u003c\/strong\u003e Sierra part 18-0334 is a gasket designed to seal the mounting plate to driveshaft housing joint on Mercury outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-0334 gasket straightforward?\u003c\/strong\u003e Yes, the Sierra 18-0334 is a direct-fit gasket that installs between the mounting plate and driveshaft housing during reassembly, following standard gasket installation practice for that joint.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988065333467,"sku":"SIE-18-0334","price":3.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0334_lg__19203.1558121129.500.750.jpg?v=1785188820"},{"product_id":"sierra-18-0403-intake-manifold-gasket-kit-for-mercruiser-7-4l-454-502-mag-bravo-ii-mie-8-2l-1978-1997-replaces-27-805722a1","title":"Sierra 18-0403 Intake Gasket Kit, Replaces Mercury Marine 27-52571, Fits MCM 370\/400\/325\/454\/502 Mag \u0026 MIE 82L 1978-1997","description":"\u003cp\u003eThe Sierra 18-0403 Intake Gasket Kit is a complete gasket set engineered to seal the intake manifold on select Mercury Marine sterndrive and inboard engines. This kit is built as a direct equivalent to the original Mercury Marine intake gasket, giving boat owners and marine technicians a reliable way to restore a proper seal at the intake manifold without sourcing a discontinued or hard-to-find factory part.\u003c\/p\u003e\u003cp\u003eThe kit includes the full complement of gaskets needed for a complete intake gasket replacement in a single package, finished in white. It is designed for use on MCM 370, 400, 325, 454, and 502 Mag engines, as well as the 74L Bravo II and MIE 82L, covering the 1978-1997 production span for these applications. Installing a fresh intake gasket kit at this interval helps prevent coolant, oil, or intake air leaks caused by a hardened or degraded factory gasket.\u003c\/p\u003e\u003cp\u003eAt 0.61 pounds, the 18-0403 kit ships as a compact, ready-to-install package. Because it carries the Sierra 18-0403 part number and cross-references Mercury Marine 27-52571, it can be ordered with confidence as a fit-for-purpose replacement rather than a generic aftermarket substitute.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0403\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Intake Gasket Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Intake Gasket Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.61 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282200602\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-52571\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMCM 370, 400, 325, 454, 502 Mag\u003c\/li\u003e\n\u003cli\u003e74L Bravo II\u003c\/li\u003e\n\u003cli\u003eMIE 82L\u003c\/li\u003e\n\u003cli\u003e1978-1997\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-52571\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0403 intake gasket kit fit?\u003c\/strong\u003e The 18-0403 kit fits MCM 370, 400, 325, 454, and 502 Mag engines, along with the 74L Bravo II and MIE 82L, covering the 1978-1997 model years for these applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does this gasket kit replace?\u003c\/strong\u003e This kit cross-references Mercury Marine OEM number 27-52571, so it can be ordered as a direct equivalent to that factory part under Sierra part number 18-0403.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0403 intake gasket kit weigh?\u003c\/strong\u003e It weighs 0.61 pounds as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0403 gasket kit?\u003c\/strong\u003e It is finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a complete gasket set or a single gasket?\u003c\/strong\u003e The 18-0403 is a kit that includes the full set of intake gaskets needed for the job, not a single individual gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this kit work on any Mercury Marine engine?\u003c\/strong\u003e No, the 18-0403 is designed specifically for the MCM 370, 400, 325, 454, and 502 Mag engines and the 74L Bravo II and MIE 82L from 1978-1997; it is not a universal fit across all Mercury Marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0403 kit genuine Sierra or a generic aftermarket part?\u003c\/strong\u003e It is a genuine Sierra-branded part, sold under Sierra part number 18-0403, engineered as a cross-reference match to Mercury Marine 27-52571 rather than a generic substitute.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the intake gasket with this kit?\u003c\/strong\u003e An intake gasket kit like the 18-0403 should be installed any time the intake manifold is removed or when signs of a leaking intake seal, such as coolant or oil seepage at the manifold, are present.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0403 kit include everything needed for installation?\u003c\/strong\u003e Yes, the kit's included components consist of the intake gasket set required for the job, packaged together as the 18-0403.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0403 intake gasket kit?\u003c\/strong\u003e The UPC for this product is 808282200602.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 74L Bravo II use the same intake gasket kit as the MCM engines?\u003c\/strong\u003e Yes, the Sierra 18-0403 kit covers the 74L Bravo II in addition to the MCM 370, 400, 325, 454, 502 Mag, and MIE 82L engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988073591003,"sku":"SIE-18-0403","price":86.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0403_lg__25780.1558120638.500.750.jpg?v=1785188517"},{"product_id":"sierra-18-0411-oil-pan-gasket-set-for-mercruiser-gm-350-cid-5-7l-starboard-dipstick-replaces-27-90458a1","title":"Sierra 18-0411 Oil Pan Gasket Set, Replaces 27-90458A1 \u0026 27-90458, for Mercruiser GM 350 CID (5.7L) Starboard Dipstick Engines","description":"\u003cp\u003eThe Sierra 18-0411 Oil Pan Gasket Set is a replacement gasket kit engineered for Mercruiser GM 350 CID (5.7L) marine engines equipped with a starboard dipstick configuration. It is built to meet or exceed the quality of the original equipment gasket it replaces, providing a reliable seal between the oil pan and engine block to prevent oil leaks and maintain proper lubrication pressure. Each set is manufactured to precise tolerances so it seats correctly against factory mating surfaces without the need for excessive sealant buildup.\u003c\/p\u003e\u003cp\u003eThis gasket set is a direct cross-reference for several OEM and aftermarket part numbers, making it a straightforward swap when servicing or rebuilding a Mercruiser GM 350 CID (5.7L) engine with a starboard-side dipstick. It ships as a complete set so installers have the gaskets needed for the job in one package, reducing trips back to the parts counter mid-repair. Sierra part 18-0411 is sold under the UPC 030999873842 for easy identification and ordering.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0411\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Oil Pan Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.3 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999873842\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-90458A1, 27-90458, FI5000178, FI5000183\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercruiser GM 350 CID (5.7L), Starboard Dipstick\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser GM 350 CID (5.7L) engines with starboard dipstick\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-90458A1\u003c\/li\u003e\n\u003cli\u003e27-90458\u003c\/li\u003e\n\u003cli\u003eFI5000178\u003c\/li\u003e\n\u003cli\u003eFI5000183\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-0411 Oil Pan Gasket Set fit?\u003c\/strong\u003e It fits Mercruiser GM 350 CID (5.7L) engines that use a starboard-side dipstick configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does 18-0411 replace?\u003c\/strong\u003e Sierra 18-0411 cross-references to 27-90458A1, 27-90458, FI5000178, and FI5000183.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0411 gasket set an OEM part or an aftermarket replacement?\u003c\/strong\u003e It is an aftermarket gasket set manufactured by Sierra to meet or exceed the quality of the original equipment oil pan gasket it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0411 Oil Pan Gasket Set weigh?\u003c\/strong\u003e The Sierra 18-0411 Oil Pan Gasket Set weighs 0.3 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-0411 gasket material?\u003c\/strong\u003e The gasket set is white in color.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets are included in the 18-0411 set?\u003c\/strong\u003e The Sierra 18-0411 Oil Pan Gasket Set is packaged as one complete set (1 unit) covering the oil pan sealing job.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill 18-0411 work on a Mercruiser engine with a port-side dipstick?\u003c\/strong\u003e Sierra 18-0411 is designated for the GM 350 CID (5.7L) engine configuration with a starboard dipstick; a port-dipstick engine should be matched against fitment before ordering, since these are distinct dipstick configurations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0411 gasket set?\u003c\/strong\u003e The UPC for the Sierra 18-0411 Oil Pan Gasket Set is 030999873842.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0411 gasket set require additional sealant during installation?\u003c\/strong\u003e The Sierra 18-0411 Oil Pan Gasket Set is manufactured to seal properly against factory mating surfaces without needing excessive sealant buildup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-0411 the correct part number to order for this gasket set?\u003c\/strong\u003e Yes, 18-0411 is the Sierra part number for this oil pan gasket set, and it is the number to reference when ordering.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988073623771,"sku":"SIE-18-0411","price":35.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0411_lg__96798.1558120955.500.750.jpg?v=1785188038"},{"product_id":"intake-manifold-gasket-set-27-8243261-for-mercruiser-4-3l-262-mag-gen-ii-1996-up-sierra-18-0487","title":"Sierra 18-0487 Intake Manifold Gasket for Mercury 4.3L and MCM 262 Mag Engines, Replaces 27-8243261","description":"\u003cp\u003eThe Sierra 18-0487 is an intake manifold gasket built to seal the connection between the intake manifold and cylinder heads on select Mercury marine engines, preventing air, fuel, and coolant leaks at that joint. It is a direct replacement for Mercury gasket 27-8243261, giving boat owners and technicians a way to source the correct seal without going through Mercury directly. The gasket is engineered to match the original fit for the MCM 262 Mag and 4.3L\/LX\/LH\/LXH (Gen+) engine family, 1996 and later, so it lines up with the factory mounting points and sealing surfaces without modification.\u003c\/p\u003e\u003cp\u003eEach package contains one gasket (Sierra part number 18-0487), identified by UPC 808282187248. As a wear item, the intake manifold gasket is typically replaced whenever the intake manifold is removed for service, or when a leak develops at the intake-to-head joint. Installing the correct gasket helps maintain proper sealing and engine performance on the engines it is designed for.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0487\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Intake Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282187248\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.35 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 27-8243261\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMCM 262 Mag and 4.3L\/LX\/LH\/LXH (Gen+) engines, 1996 and later\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-8243261\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0487 intake manifold gasket fit?\u003c\/strong\u003e The Sierra 18-0487 fits the MCM 262 Mag and 4.3L\/LX\/LH\/LXH (Gen+) Mercury engine family, 1996 and later.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0487 a cross-reference for Mercury gasket 27-8243261?\u003c\/strong\u003e Yes, the 18-0487 is a direct replacement for Mercury intake manifold gasket 27-8243261.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets are included with the Sierra 18-0487?\u003c\/strong\u003e One intake manifold gasket is included per package of the Sierra 18-0487.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0487 gasket weigh?\u003c\/strong\u003e The Sierra 18-0487 intake manifold gasket weighs 0.35 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0487 intake manifold gasket?\u003c\/strong\u003e The UPC for the Sierra 18-0487 is 808282187248.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0487 fit 4.3L LX and LH engine variants?\u003c\/strong\u003e Yes, the 18-0487 is designed for the 4.3L\/LX\/LH\/LXH (Gen+) engines in addition to the MCM 262 Mag.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this intake manifold gasket?\u003c\/strong\u003e Replacement of the 18-0487 is typically needed when the intake manifold is removed for service or when a leak develops at the intake-to-head sealing surface on a fitted MCM 262 Mag or 4.3L\/LX\/LH\/LXH (Gen+) engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat Sierra part number should I order for this Mercury gasket?\u003c\/strong\u003e Order Sierra part number 18-0487, which replaces Mercury gasket 27-8243261.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0487 an OEM Mercury part or an aftermarket equivalent?\u003c\/strong\u003e The 18-0487 is a Sierra-brand gasket manufactured as a replacement for Mercury gasket 27-8243261, not an OEM Mercury part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat model year range does the 18-0487 gasket cover?\u003c\/strong\u003e The 18-0487 is listed for MCM 262 Mag and 4.3L\/LX\/LH\/LXH (Gen+) engines built in 1996 or later.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988075294939,"sku":"SIE-18-0487","price":85.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0487_lg__64552.1558121261.500.750.jpg?v=1785188467"},{"product_id":"sierra-18-0488-intake-manifold-gasket-set-replaces-mercury-27-807473a1-fits-mercruiser-350-mag-5-0l-5-7l-lx-gen-ii-1996-up","title":"Sierra 18-0488 Intake Gasket, Replaces Mercury Marine 27-807473A1","description":"\u003cp\u003eThe Sierra 18-0488 is a white intake gasket engineered as a direct equivalent for Mercury Marine engines that call for OEM number 27-807473A1. It seats between the intake manifold and engine block to seal against exhaust gas and coolant leakage at the intake mating surface, a common failure point as factory gaskets age and lose compression. The gasket is round in shape and manufactured to OEM specifications for fit and sealing performance, making it a straightforward like-for-like replacement during a manifold gasket job or general engine maintenance. At 0.33 pounds, it ships as a single-count gasket ready to install without modification. Because it is built to OEM dimensions and material specification, it installs the same way the original Mercury Marine gasket does, using the same fastener pattern and sealing surface, so no special tools or adapters are required beyond a standard gasket replacement procedure.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0488\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Intake Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.33 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282187255\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Mercury Marine engines originally fitted with intake gasket 27-807473A1.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-807473A1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0488 intake gasket fit?\u003c\/strong\u003e The Sierra 18-0488 is built as a direct equivalent for Mercury Marine intake applications that originally used OEM gasket 27-807473A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-0488 the same as Mercury Marine 27-807473A1?\u003c\/strong\u003e Yes, part number 18-0488 is manufactured to replace Mercury Marine OEM gasket 27-807473A1 directly, matching its fit and sealing function.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is this gasket?\u003c\/strong\u003e The 18-0488 intake gasket is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the Sierra 18-0488 gasket?\u003c\/strong\u003e It is round in shape, matching the sealing surface it is designed to cover.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0488 intake gasket weigh?\u003c\/strong\u003e This gasket weighs 0.33 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-0488 gasket manufactured?\u003c\/strong\u003e The country of origin for the 18-0488 intake gasket is Taiwan.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Mercury Marine part or an aftermarket replacement?\u003c\/strong\u003e The 18-0488 is a Sierra-branded aftermarket gasket engineered to OEM specifications as a replacement for Mercury Marine 27-807473A1, not a genuine Mercury Marine part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in the package?\u003c\/strong\u003e The Sierra 18-0488 is sold as a single gasket, one unit per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the 18-0488 gasket myself?\u003c\/strong\u003e Yes, since it matches the OEM fit and dimensions of 27-807473A1, it installs the same way as the original Mercury Marine gasket during a standard intake manifold service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0488 intake gasket?\u003c\/strong\u003e The UPC for the 18-0488 intake gasket is 808282187255.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988075360475,"sku":"SIE-18-0488","price":50.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0488_lg__65705.1558121335.500.750.jpg?v=1785187970"},{"product_id":"sierra-18-0539-exhaust-leg-rubber-seal-gasket-for-mercury-outboards-replaces-mercury-37721-37721001-glm-85630","title":"Sierra 18-0539 Rubber Seal Gasket - Replaces Mercury 37721","description":"\u003cp\u003eThe Sierra 18-0539 Rubber Seal Gasket is a rubber exhaust leg seal used in Mercury outboard cooling systems. It is designed as a direct replacement for the original equipment seal, restoring a tight, leak-free connection where the exhaust leg meets the powerhead cooling passages. A worn or hardened rubber seal in this location can allow water or exhaust gases to escape past the joint, so replacing it with a properly sized gasket like the 18-0539 helps maintain correct sealing pressure and cooling system integrity.\u003c\/p\u003e\u003cp\u003eMade of rubber, this seal is compact and precisely sized to fit its intended mounting location, with dimensions of 0.39 x 0.39 x 0.39 inches and a weight of 0.07 pounds. It is built to meet or exceed the quality of the original equipment part it replaces, making it a reliable choice for routine maintenance or repair of the exhaust cooling seal. This is a small, low-cost component, but correct fitment matters since it is engineered as a like-for-like replacement for Mercury 37721.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0539\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Rubber Seal Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999874474\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury 37721\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0539 used for?\u003c\/strong\u003e The Sierra 18-0539 is a rubber seal gasket used in the exhaust leg area of Mercury outboard cooling systems, sealing the joint to prevent water or exhaust leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0539 a direct replacement for Mercury 37721?\u003c\/strong\u003e Yes, the 18-0539 is manufactured as a direct replacement for Mercury part 37721.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-0539 seal made from?\u003c\/strong\u003e It is made of rubber, which allows it to compress and form a tight seal against mating surfaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0539 gasket weigh?\u003c\/strong\u003e This gasket weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-0539 rubber seal?\u003c\/strong\u003e The seal measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0539 meet OEM quality standards?\u003c\/strong\u003e Sierra manufactures the 18-0539 to meet or exceed the quality of the original equipment Mercury 37721 seal it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0539 gasket?\u003c\/strong\u003e The UPC for the Sierra 18-0539 Rubber Seal Gasket is 030999874474.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0539 only for Mercury outboards?\u003c\/strong\u003e The 18-0539 is designed to replace the Mercury 37721 seal used in Mercury outboard cooling systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the package with the 18-0539?\u003c\/strong\u003e The Sierra 18-0539 is sold as a single rubber seal gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace this rubber seal?\u003c\/strong\u003e Over time the rubber in an exhaust leg seal like the 18-0539 can harden or crack, allowing leaks; replacing it with a new Sierra 18-0539 restores a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the Sierra 18-0539 be reused after removal?\u003c\/strong\u003e No, once a rubber seal gasket like the 18-0539 is compressed and removed it typically loses its sealing ability and should be replaced with a new one.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988077064411,"sku":"SIE-18-0539","price":8.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0539_lg__42314.1558119442.500.750.jpg?v=1785189148"},{"product_id":"sierra-18-0549-plug-off-cap-replaces-omc-909829-1-in-i-d-fits-v-8-stern-drives-inboards-1977-present","title":"Sierra 18-0549 Plug Off Cap, 1 Inch I.D., Replaces OMC 909829, V-8 Stern Drives and Inboards 1977 to Present","description":"\u003cp\u003eThe Sierra 18-0549 Plug Off Cap is a machined marine plug designed to seal a 1 inch inside-diameter opening on qualifying V-8 model stern drives and inboards built from 1977 to present. It is a direct replacement for OMC part number 909829, making it a straightforward swap when the original plug is damaged, corroded, or missing during service and inspection work. The cap is a simple, single-piece component with no moving parts, built to hold a reliable seal against water and fluid intrusion at its mounting location. Its compact size and light weight of 0.05 pounds make it an easy, low-cost item to keep on hand as a spare for routine maintenance. Buyers working on qualifying V-8 stern drive and inboard applications should confirm the 1 inch I.D. Opening size before ordering, since Sierra also offers the 18-0550 Plug Off Cap with a larger 1 1\/4 inch I.D. For the same application range but a different opening size. The 18-0549 carries UPC 030999874535 for easy identification when ordering or verifying stock.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0549\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter:\u003c\/strong\u003e 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 4 x 1 x 5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.05 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999874535\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e V-8 Model Stern Drives and Inboards (1977 to present)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces:\u003c\/strong\u003e OMC 909829\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eV-8 Model Stern Drives and Inboards (1977 to present)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 909829\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0549 Plug Off Cap?\u003c\/strong\u003e It is a machined plug off cap made by Sierra, part number 18-0549, used to seal a 1 inch inside-diameter opening on qualifying V-8 model stern drives and inboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the inside diameter of the 18-0549 plug off cap?\u003c\/strong\u003e The 18-0549 has a 1 inch inside diameter (I.D.).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines and drives does the Sierra 18-0549 fit?\u003c\/strong\u003e This cap fits V-8 model stern drives and inboards built from 1977 to present.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0549 replace OMC part number 909829?\u003c\/strong\u003e Yes, the 18-0549 is a direct replacement for OMC 909829.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the Sierra 18-0549 and Sierra 18-0550?\u003c\/strong\u003e The 18-0549 has a 1 inch I.D. And replaces OMC 909829, while the 18-0550 has a larger 1 1\/4 inch I.D. And replaces OMC 909830; both cover V-8 model stern drives and inboards from 1977 to present but are separate part numbers, so the correct one depends on the opening size on your unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0549 plug off cap weigh?\u003c\/strong\u003e It weighs 0.05 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0549 a genuine Sierra part?\u003c\/strong\u003e Yes, the 18-0549 is manufactured under the Sierra brand and is not discontinued.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0549 plug off cap?\u003c\/strong\u003e The UPC for this Sierra plug off cap is 030999874535.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-0549 fit a 1 1\/4 inch opening?\u003c\/strong\u003e No, the 18-0549 is sized for a 1 inch I.D. Opening; a 1 1\/4 inch opening requires the Sierra 18-0550 instead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat years of V-8 stern drives and inboards does the 18-0549 cover?\u003c\/strong\u003e The 18-0549 plug off cap covers V-8 model stern drives and inboards from 1977 to present.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988077261019,"sku":"SIE-18-0549","price":11.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0549_lg__47603.1558119978.500.750.jpg?v=1785188055"},{"product_id":"sierra-18-0550-plug-off-cap-1-1-4-in-31-8mm-replaces-omc-909830-evinrude-johnson-3852476","title":"Sierra 18-0550 Plug Off Cap, Replaces OMC 909830, 1-1\/4 Inch","description":"\u003cp\u003eThe Sierra 18-0550 Plug Off Cap is a plastic plug cap used to seal an unused port on marine exhaust manifold applications. It is sized for a 1-1\/4 inch (31.8mm) opening and is molded in white plastic for durability in the marine engine compartment environment. This cap is designed as a direct aftermarket equivalent to OMC 909830, meeting or exceeding the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003eThe 18-0550 is a simple, purpose-built component: a single plug that presses or threads into place to close off an exhaust manifold port that is not being used in a given engine configuration, keeping the cooling and exhaust system sealed properly. Because it is interchangeable with several OEM and aftermarket cross-reference numbers, it can be used to service a range of OMC, Evinrude\/Johnson, GLM, and Mallory-numbered applications that call for this same 1-1\/4 inch plug cap. Each unit ships as a single cap ready to install.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0550\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Plug Off Cap\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter:\u003c\/strong\u003e 1-1\/4 inch (31.8mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.08 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 plug off cap per unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e GLM 22280, Evinrude\/Johnson 909830, 3852476, Mallory 9-42721, OMC 909830\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits applications calling for a 1-1\/4 inch (31.8mm) exhaust manifold plug off cap, including those originally equipped with OMC 909830 or 3852476.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 22280\u003c\/li\u003e\n\u003cli\u003eEvinrude\/Johnson 909830\u003c\/li\u003e\n\u003cli\u003e3852476\u003c\/li\u003e\n\u003cli\u003eMallory 9-42721\u003c\/li\u003e\n\u003cli\u003eOMC 909830\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0550 Plug Off Cap used for?\u003c\/strong\u003e The Sierra 18-0550 is a plastic plug cap that seals an unused 1-1\/4 inch exhaust manifold port on applicable marine engines, keeping the exhaust and cooling passages closed off where a fitting is not installed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the Sierra 18-0550 plug off cap?\u003c\/strong\u003e It has a 1-1\/4 inch (31.8mm) inside diameter, sized to fit the port opening it is designed to seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0550 replace OMC 909830?\u003c\/strong\u003e Yes, the Sierra 18-0550 is interchangeable with OMC 909830 and is built to meet or exceed the performance of that original equipment part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat other part numbers cross-reference to the Sierra 18-0550?\u003c\/strong\u003e The 18-0550 is interchangeable with GLM 22280, Evinrude\/Johnson 909830, Evinrude\/Johnson 3852476, Mallory 9-42721, and OMC 909830 and 3852476.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-0550 plug off cap made from?\u003c\/strong\u003e It is made of white plastic, a lightweight material suited to sealing exhaust manifold ports in the marine engine compartment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0550 genuine OEM or aftermarket?\u003c\/strong\u003e It is a Sierra aftermarket part manufactured to meet or exceed the specifications of the original equipment part it replaces, such as OMC 909830.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many plug off caps come in one Sierra 18-0550 package?\u003c\/strong\u003e One Sierra 18-0550 plug off cap is included per unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0550 plug off cap weigh?\u003c\/strong\u003e The 18-0550 weighs 0.08 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-0550 be used in place of a Mallory 9-42721 cap?\u003c\/strong\u003e Yes, the Mallory 9-42721 is one of the cross-reference numbers the Sierra 18-0550 is interchangeable with.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0550 threaded or a press-fit plug?\u003c\/strong\u003e The 18-0550 is a plug off cap sized to a 1-1\/4 inch (31.8mm) opening; specific thread or press-fit installation details beyond that sizing are not specified.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988078506203,"sku":"SIE-18-0550","price":10.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__72359.1771572386.500.750.jpg?v=1785188038"},{"product_id":"sierra-18-0659-o-ring-for-pressure-control-valve-yamaha-outboard-gearcase-drive","title":"Sierra O-Ring for Pressure Control Valve, Part Number 18-0659","description":"\u003cp\u003eThis is a genuine Sierra O-ring engineered specifically for the pressure control valve on marine engine applications. It is designed as a direct seal replacement, restoring proper sealing at the pressure control valve where an original O-ring has hardened, cracked, or lost its seal over time. As a small, single-component seal, its role is simple but critical: prevent pressure loss and leakage at the valve interface, helping the pressure control valve function as intended. Each unit is sold as a single O-ring identified by Sierra part number 18-0659.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0659\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e O-Ring, Pressure Control Valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282388775\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 O-ring per pack\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is Sierra part 18-0659 used for?\u003c\/strong\u003e Sierra 18-0659 is an O-ring designed to seal the pressure control valve on a marine engine, replacing a worn or damaged original seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many O-rings come in one order of 18-0659?\u003c\/strong\u003e Each order of Sierra 18-0659 includes one O-ring, sold as a single unit for one pressure control valve.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0659 a genuine Sierra part?\u003c\/strong\u003e Yes, 18-0659 is a genuine Sierra O-ring, not a generic or universal seal, made specifically for the pressure control valve application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0659 O-ring weigh?\u003c\/strong\u003e The Sierra 18-0659 O-ring weighs 0.01 pounds, reflecting its small size as a single seal component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for Sierra 18-0659?\u003c\/strong\u003e The UPC for the Sierra 18-0659 pressure control valve O-ring is 808282388775.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the pressure control valve O-ring?\u003c\/strong\u003e Replace the O-ring on the pressure control valve, such as Sierra 18-0659, if you notice a loss of pressure, fluid seepage around the valve, or a visibly cracked or flattened seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-0659 include the pressure control valve itself?\u003c\/strong\u003e No, this part covers only the O-ring seal for the pressure control valve, not the valve body or assembly itself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan 18-0659 be used as a general-purpose O-ring?\u003c\/strong\u003e Sierra 18-0659 is manufactured specifically for the pressure control valve application rather than as a generic all-purpose seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-0659 O-ring simple?\u003c\/strong\u003e Installing the Sierra 18-0659 O-ring is a straightforward seal replacement at the pressure control valve, requiring removal of the old O-ring and seating the new one in its place.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy choose the Sierra 18-0659 over a generic O-ring?\u003c\/strong\u003e The Sierra 18-0659 is sized and specified for the pressure control valve, so it fits and seals correctly where a generic O-ring may not match the required dimensions.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988083912923,"sku":"SIE-18-0659","price":4.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-0659__89853.1739477160.500.750.jpg?v=1785188985"},{"product_id":"reed-plate-gasket-for-mercury-outboards-replaces-27-14697-2-sierra-18-0644","title":"Sierra 18-0644 Reed Plate Gasket for Mercury Outboards, Replaces 27-146972","description":"\u003cp\u003eThe Sierra 18-0644 Reed Plate Gasket is a replacement gasket engineered to seal the reed plate assembly on applicable Mercury outboard engines. It is built to meet or exceed the quality of the original equipment part it replaces, giving boaters a reliable seal that helps maintain proper crankcase compression and prevent air leaks at the reed block interface. The gasket is white in color and is sized to match the original reed plate mounting surface it is designed for.\u003c\/p\u003e\u003cp\u003eReed plate gaskets are a wear item that should be replaced any time the reed valve assembly is removed for inspection or service, since a used gasket can lose its ability to seal properly once disturbed. Installing a fresh Sierra 18-0644 gasket during reed plate maintenance helps restore a tight seal between mating surfaces and supports consistent engine performance. This part cross-references directly to GLM 37530 and Mercury 27-146972, making it straightforward to identify as a correct match when replacing a worn or damaged original gasket.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0644\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Reed Plate Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282242824\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 0.508 centimeters H x 17.78 centimeters L x 35.56 centimeters W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e China\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e GLM 37530, Mercury 27-146972\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eSpecific engine models and year ranges are not specified for this part; it is cross-referenced to GLM 37530 and Mercury 27-146972.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 37530\u003c\/li\u003e\n\u003cli\u003eMercury 27-146972\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0644 Reed Plate Gasket used for?\u003c\/strong\u003e It seals the reed plate assembly on applicable Mercury outboard engines, helping maintain proper compression and preventing air leaks at the reed block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0644 gasket cross-reference to any OEM numbers?\u003c\/strong\u003e Yes, the Sierra 18-0644 is interchangeable with GLM 37530 and Mercury 27-146972.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0644 equivalent to the Mercury 27-146972 gasket?\u003c\/strong\u003e Yes, Mercury 27-146972 is a direct cross-reference for the Sierra 18-0644 Reed Plate Gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the reed plate gasket?\u003c\/strong\u003e The Sierra 18-0644 Reed Plate Gasket is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0644 gasket weigh?\u003c\/strong\u003e It weighs 0.2 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of the Sierra 18-0644 gasket?\u003c\/strong\u003e The package measures 0.508 centimeters H by 17.78 centimeters L by 35.56 centimeters W.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-0644 Reed Plate Gasket manufactured?\u003c\/strong\u003e The country of origin for the Sierra 18-0644 is China.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-0644 is a genuine Sierra branded part, manufactured to meet or exceed the quality of the original equipment gasket it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the reed plate gasket be replaced?\u003c\/strong\u003e Any time the reed valve assembly on the outboard is removed for inspection or service, since a used gasket can lose its ability to seal once disturbed; the Sierra 18-0644 is designed as a fresh replacement for that job.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when ordering part 18-0644?\u003c\/strong\u003e The order includes one Sierra 18-0644 Reed Plate Gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the GLM 37530 gasket the same as the Sierra 18-0644?\u003c\/strong\u003e Yes, GLM 37530 is listed as an interchangeable cross-reference for the Sierra 18-0644 Reed Plate Gasket.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988083978459,"sku":"SIE-18-0644","price":10.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0644_lg__79096.1558120179.500.750.jpg?v=1785188267"},{"product_id":"oil-seal-housing-gasket-for-suzuki-f25-v-twin-2006-2007-replaces-oem-56132-95j00","title":"Sierra Drain Plug Gasket 09168-10022 Replacement for Suzuki Outboards, Package of 5","description":"\u003cp\u003eThis Sierra drain plug gasket, part number 18-0650, is a direct-fit sealing gasket designed for Suzuki outboard motor drain plug applications. It creates a reliable seal at the drain plug to prevent oil or fluid leaks during routine maintenance and oil changes. Each gasket is a direct cross-reference replacement for OEM number 09168-10022, so it installs the same way the original factory gasket did, with no modification needed.\u003c\/p\u003e\u003cp\u003eSold as a package of 5, this gasket lets boat owners and marine technicians keep spares on hand for scheduled maintenance intervals, since drain plug gaskets are a wear item that should be replaced each time the drain plug is removed to maintain a proper seal. Using a fresh gasket at every oil change helps prevent weeping or leaking at the drain plug and protects against contamination of the lower unit or crankcase.\u003c\/p\u003e\u003cp\u003eAs a Sierra part, this gasket is built to match OEM specifications for fit and sealing performance on applicable Suzuki outboard motors.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0650\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Drain Plug Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 5 gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282226619\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eSuzuki outboard motors.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e09168-10022\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does Sierra part 18-0650 replace?\u003c\/strong\u003e Sierra 18-0650 is a direct cross-reference replacement for OEM part number 09168-10022, so it can be installed anywhere that OEM gasket is called for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package of 18-0650?\u003c\/strong\u003e Each package contains 5 drain plug gaskets, giving you enough spares for multiple oil changes or services.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the weight of the Sierra 18-0650 gasket package?\u003c\/strong\u003e The Sierra 18-0650 drain plug gasket package weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is Sierra 18-0650 used for?\u003c\/strong\u003e It is a drain plug gasket used to create a seal at the drain plug on applicable Suzuki outboard motors, preventing oil or fluid leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould the drain plug gasket be replaced every oil change?\u003c\/strong\u003e Yes, drain plug gaskets like Sierra 18-0650 are a wear item and should be replaced each time the drain plug is removed to maintain a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-0650 an OEM or aftermarket part?\u003c\/strong\u003e Sierra 18-0650 is an aftermarket gasket manufactured to match the fit and seal of OEM part 09168-10022.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat outboard brand is Sierra 18-0650 designed for?\u003c\/strong\u003e This gasket is designed for use on Suzuki outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order Sierra 18-0650?\u003c\/strong\u003e Ordering Sierra 18-0650 gets you a package of 5 individual drain plug gaskets, with no additional hardware included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan Sierra 18-0650 be used for other applications besides the drain plug?\u003c\/strong\u003e Sierra 18-0650 is specified as a drain plug gasket cross-referencing OEM 09168-10022, so it is intended for drain plug sealing applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy a 5-pack instead of a single drain plug gasket?\u003c\/strong\u003e Buying the 5-pack of Sierra 18-0650 gaskets lets you keep spares on hand since a new gasket is recommended at every drain plug removal, reducing the need for repeat orders.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988084076763,"sku":"SIE-18-0650","price":2.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0650_lg__12931.1558120522.500.750.jpg?v=1785329155"},{"product_id":"sierra-18-0645-reed-plate-gasket-for-mercury-mariner-outboard-replaces-oem-27-14697-2","title":"Sierra 18-0645 Adapter Plate Gasket for Mercury\/Mariner Outboard Motors, White","description":"\u003cp\u003eThe Sierra 18-0645 Adapter Plate Gasket is a replacement gasket engineered for Mercury and Mariner outboard motors. It seals the adapter plate joint on the powerhead, helping maintain a proper seal against water and combustion gases so the engine runs as designed. The gasket is manufactured to OEM specifications, meaning it is built to meet or exceed the performance of the original equipment part it replaces, giving boat owners a dependable option when servicing the adapter plate area during a rebuild, tune-up, or routine maintenance.\u003c\/p\u003e\u003cp\u003eFinished in white and featuring a round profile to match the adapter plate mounting pattern, this gasket is designed for a straightforward, direct-fit installation without modification. Sierra builds this part to stand up to the demanding conditions of the marine environment, including exposure to fuel, oil, heat, and moisture, so it holds its seal over time. As a fit type listed as universal for Mercury\/Mariner outboard applications, it is a practical replacement part to keep on hand for outboard maintenance and repair work.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0645\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e OEM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit Type:\u003c\/strong\u003e Universal Fit for Mercury\/Mariner outboard motors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282242831\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury\/Mariner outboard motors (universal fit)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0645 gasket used for?\u003c\/strong\u003e It is an adapter plate gasket that seals the adapter plate joint on Mercury and Mariner outboard motors, helping maintain a proper seal during engine operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0645 gasket fit all Mercury and Mariner outboards?\u003c\/strong\u003e It is listed as a universal fit for Mercury\/Mariner outboard motors rather than being restricted to one specific model or year range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-0645 adapter plate gasket?\u003c\/strong\u003e The gasket is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the Sierra 18-0645 gasket?\u003c\/strong\u003e It has a round shape, matching the adapter plate mounting pattern it is designed to seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0645 gasket weigh?\u003c\/strong\u003e The Sierra 18-0645 adapter plate gasket weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0645 gasket an OEM part or aftermarket?\u003c\/strong\u003e It is an aftermarket gasket manufactured to OEM specifications, meaning it is built to meet or exceed the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-0645 gasket made from?\u003c\/strong\u003e It is made to OEM material specifications for the adapter plate application on Mercury\/Mariner outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the 18-0645 gasket myself?\u003c\/strong\u003e Yes, it is designed as a direct-fit replacement for the adapter plate joint, suitable for use during a standard powerhead service or rebuild.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part number 18-0645?\u003c\/strong\u003e The order includes one Sierra adapter plate gasket, part number 18-0645.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy choose the Sierra 18-0645 over a generic gasket?\u003c\/strong\u003e Sierra manufactures the 18-0645 to meet or exceed the specifications of the original equipment part, offering a dependable seal for the marine environment rather than a generic substitute.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988084371675,"sku":"SIE-18-0645","price":9.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0645_lg__06291.1558120251.500.750.jpg?v=1785188089"},{"product_id":"sierra-18-0826-exhaust-cover-gasket-for-yamaha-outboards-replaces-oem-688-41112-a0-00","title":"Sierra 18-0826 Drain Screw Gasket, OEM 90430-14115-00-00, Yamaha Outboard","description":"\u003cp\u003eThe Sierra 18-0826 is a drain screw gasket engineered as a direct replacement for Yamaha outboard motors, sealing the drain screw to prevent oil or fluid seepage at the drain point. It is built from aluminum construction and finished in red, matching the original equipment appearance for a clean, factory-correct look on reinstallation. This is a small but critical sealing component: a worn or reused drain screw gasket is a common source of slow oil weeps around the drain plug, so replacing it whenever the drain screw is removed for a service interval helps maintain a proper seal and keeps the powerhead free of leaks.\u003c\/p\u003e\u003cp\u003eSierra manufactures the 18-0826 to match the Yamaha OEM specification 90430-14115-00-00, so it installs the same way as the original gasket with no modification required. It ships as a single gasket (package quantity of 1) sized to fit the drain screw location on covered Yamaha outboard engines. Given its light weight and compact size, it is typically kept on hand as a routine maintenance part alongside other gaskets replaced during oil changes or lower-unit service.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0826\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Drain Screw Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Red\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 1 inch x 1 inch x 0.3 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Type:\u003c\/strong\u003e 4 Stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Gasoline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999874757\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 90430-14115-00-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits Yamaha outboard motors using drain screw gasket 90430-14115-00-00.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e90430-14115-00-00\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0826 fit?\u003c\/strong\u003e The Sierra 18-0826 drain screw gasket is designed for Yamaha outboard motors and is a direct match for OEM part 90430-14115-00-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0826 the same as the Yamaha OEM gasket?\u003c\/strong\u003e Yes, the Sierra 18-0826 is manufactured to the same specification as Yamaha OEM number 90430-14115-00-00 and installs the same way.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the drain screw gasket made from?\u003c\/strong\u003e It is made from aluminum, finished in red to match the original Yamaha appearance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e The Sierra 18-0826 ships as a single gasket, with a package quantity of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-0826?\u003c\/strong\u003e Packaged dimensions are 1 inch by 1 inch by 0.3 inch, reflecting the small size typical of a drain screw gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0826 weigh?\u003c\/strong\u003e The Sierra 18-0826 weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace this gasket?\u003c\/strong\u003e This drain screw gasket should be replaced any time the drain screw is removed, such as during an oil change or lower-unit service, since a reused gasket is a common source of slow leaks around the drain plug.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0826 an aftermarket or genuine part?\u003c\/strong\u003e The 18-0826 is a Sierra-manufactured gasket built to match the Yamaha OEM specification 90430-14115-00-00, rather than a Yamaha-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engine type is this gasket used with?\u003c\/strong\u003e The Sierra 18-0826 drain screw gasket is used on 4 stroke gasoline outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the color of the gasket matter for fit?\u003c\/strong\u003e No, the red finish on the Sierra 18-0826 is a cosmetic match to the original equipment and does not affect the seal or fit.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988085879003,"sku":"SIE-18-0826","price":1.77,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0826_lg__06664.1711979440.500.750.jpg?v=1785188749"},{"product_id":"sierra-18-0879-adapter-plate-gasket-for-mercury-outboards-replaces-oem-27-38501-1","title":"Sierra 18-0879 Adapter Plate Gasket, Replaces Mercury 27-30501-1","description":"\u003cp\u003eThe Sierra 18-0879 Adapter Plate Gasket is a replacement gasket engineered to meet or exceed original equipment quality for Mercury outboard applications. It seals the adapter plate to prevent leaks and maintain proper compression at the mating surface, restoring a tight seal when the original gasket has hardened, torn, or lost its seal after removal for service. As a direct cross-reference to Mercury part number 27-30501-1, it is sized and shaped to install as a drop-in replacement without modification.\u003c\/p\u003e\u003cp\u003eThis gasket is a single-use component, meaning a new one should be installed any time the adapter plate is removed for maintenance or repair, since reusing a compressed gasket can result in leaks. It ships as a single gasket and is intended for buyers who already know they need this specific Sierra part number or its Mercury OEM equivalent.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0879\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Adapter Plate Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity per Application:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999751621\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999751621\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-30501-1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits applications specified by Mercury OEM part number 27-30501-1.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e27-30501-1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0879 Adapter Plate Gasket fit?\u003c\/strong\u003e The Sierra 18-0879 Adapter Plate Gasket is designed as a replacement for Mercury OEM part number 27-30501-1, so it fits the same adapter plate applications that number covers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-0879 the same as Mercury 27-30501-1?\u003c\/strong\u003e Yes, Sierra part number 18-0879 is the direct cross-reference to Mercury OEM number 27-30501-1, made to meet or exceed the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package?\u003c\/strong\u003e One Sierra 18-0879 Adapter Plate Gasket ships per package, matching the quantity of one used per adapter plate application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0879 gasket weigh?\u003c\/strong\u003e The Sierra 18-0879 Adapter Plate Gasket weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the adapter plate gasket be reused after removal?\u003c\/strong\u003e No, a gasket like the Sierra 18-0879 should be replaced with a new one any time the adapter plate is removed, since a used gasket has already been compressed and may no longer seal properly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-0879 is a Sierra-branded gasket built to meet or exceed the quality of the original equipment part it replaces, identified by the OEM cross-reference 27-30501-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of product is the 18-0879 gasket used in?\u003c\/strong\u003e Sierra 18-0879 is listed under Mercury Outboard Gaskets, used to seal the adapter plate on applicable Mercury outboard components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0879 gasket require any modification to install?\u003c\/strong\u003e No, the Sierra 18-0879 Adapter Plate Gasket is made as a direct replacement for Mercury 27-30501-1 and installs in place of the original without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when ordering the 18-0879 gasket?\u003c\/strong\u003e Ordering the Sierra 18-0879 includes one Adapter Plate Gasket only.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace the adapter plate gasket?\u003c\/strong\u003e An adapter plate gasket like the Sierra 18-0879 typically needs replacement after the plate is removed for service, or if the original gasket has failed and is allowing a leak at the adapter plate seal.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086108379,"sku":"SIE-18-0879","price":7.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0879_lg__38733.1558120552.500.750.jpg?v=1785188650"},{"product_id":"sierra-18-0907-oil-drain-plug-gasket-set-for-volvo-penta-200-250-270-270t-275-275a","title":"Sierra 18-0907 Gasket Set - Oil Plug Gaskets for Volvo 200, 250, 270, 270T, 275, 275A","description":"\u003cp\u003eThe Sierra 18-0907 is a gasket set engineered for oil plug applications on Volvo 200, 250, 270, 270T, 275, and 275A engines. Each gasket in the set is built from high-grade sealing material to Sierra's manufacturing standards, giving boat owners a reliable replacement for worn or hardened factory gaskets that can lead to oil seepage around the plug. Using updated manufacturing technology and design processes, Sierra produces these gaskets to match original equipment fitment and sealing performance, so installation follows the same steps as removing and replacing the factory gasket.\u003c\/p\u003e\u003cp\u003eThis set is a straightforward maintenance item for anyone servicing the oil plug on a compatible Volvo engine, whether during a routine oil change, a gasket refresh, or a broader engine service. Because the gasket is designed for O.E. Fitment, it seats correctly without modification and provides a dependable seal once torqued to the plug's specification. Sierra backs its parts, including this gasket set, with its standard customer satisfaction warranty.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0907\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Oil Plugs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282188504\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eVolvo 200, 250, 270, 270T, 275 \u0026amp; 275A\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0907 gasket set fit?\u003c\/strong\u003e It fits Volvo 200, 250, 270, 270T, 275, and 275A engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0907 used for?\u003c\/strong\u003e This gasket set is designed for oil plugs, sealing the oil plug against leaks on compatible Volvo engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in the 18-0907 set?\u003c\/strong\u003e The set ships as one item, listed as a single gasket set (Number of Items: 1).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0907 gasket set weigh?\u003c\/strong\u003e It weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0907 an OEM or aftermarket part?\u003c\/strong\u003e The 18-0907 is a Sierra-manufactured gasket set built for O.E. Fitment, sold as an aftermarket replacement rather than a Volvo-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-0907 gasket made from?\u003c\/strong\u003e Sierra manufactures the 18-0907 using high-grade gasket and sealing materials intended for durability and reliable sealing performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0907 come with a warranty?\u003c\/strong\u003e Yes, the 18-0907 gasket set is covered under Sierra's standard customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-0907 gasket set for a routine oil change?\u003c\/strong\u003e Yes, this gasket set is intended for oil plug service, making it suitable for use during an oil change on a compatible Volvo engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0907 gasket set?\u003c\/strong\u003e The UPC for this gasket set is 808282188504.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-0907 gasket seal properly without modification?\u003c\/strong\u003e Yes, the gasket is designed for O.E. Fitment on the listed Volvo engines, so it installs and seals in place of the original oil plug gasket without modification.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086173915,"sku":"SIE-18-0907","price":10.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0907_lg__52059.1558118796.500.750.jpg?v=1785189119"},{"product_id":"air-silencer-gasket-oem-314115-for-johnson-evinrude-outboards-sierra-18-0933","title":"Sierra 18-0933 Air Silencer Gasket, Replaces 314115, for Johnson\/Evinrude Outboard Motors","description":"\u003cp\u003eThe Sierra 18-0933 Air Silencer Gasket is a round replacement gasket engineered to seal the air silencer to the carburetor intake on Johnson\/Evinrude outboard motors. It is built to meet or exceed original equipment quality, giving it the fit and sealing performance of the factory gasket it replaces. This gasket restores a proper air-tight seal at the air silencer mounting point, which is essential for correct carburetor airflow and preventing intake leaks that can cause rough running or hard starting.\u003c\/p\u003e\u003cp\u003eAs a low-cost, frequently replaced maintenance part, the 18-0933 is typically installed whenever the air silencer is removed for carburetor service, cleaning, or general outboard maintenance. Its round shape and OEM-equivalent construction make it a direct swap for the original Johnson\/Evinrude gasket, and it is sold individually for a single air silencer location.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0933\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Gasket Sets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.1 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999755414\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible With:\u003c\/strong\u003e Johnson\/Evinrude Outboard Motor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 314115\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude Outboard Motor (air silencer to carburetor location)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e314115\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0933 gasket fit?\u003c\/strong\u003e The Sierra 18-0933 Air Silencer Gasket is designed for Johnson\/Evinrude outboard motors, sealing the air silencer to the carburetor intake.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-0933 replace?\u003c\/strong\u003e It replaces OEM number 314115, so any listing that references 314115 for a Johnson\/Evinrude air silencer gasket corresponds to the Sierra 18-0933.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0933 an OEM-equivalent gasket?\u003c\/strong\u003e Yes, the 18-0933 is built to meet or exceed original equipment quality, making it a direct equivalent to the factory Johnson\/Evinrude air silencer gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the 18-0933 gasket?\u003c\/strong\u003e The 18-0933 Air Silencer Gasket is round in shape, matching the mounting flange of the air silencer it seals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0933 gasket weigh?\u003c\/strong\u003e The Sierra 18-0933 weighs 0.1 pounds, consistent with its use as a thin sealing gasket rather than a structural component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the air silencer gasket?\u003c\/strong\u003e Replace the 18-0933 any time the air silencer is removed for carburetor cleaning or service, since gaskets should not be reused once broken loose from their seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-0933?\u003c\/strong\u003e Each order includes one Sierra 18-0933 Air Silencer Gasket for a single air silencer location on a Johnson\/Evinrude outboard motor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the UPC 030999755414 match the Sierra 18-0933?\u003c\/strong\u003e Yes, UPC 030999755414 is the identifier for the Sierra 18-0933 Air Silencer Gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the 18-0933 myself?\u003c\/strong\u003e Yes, the 18-0933 is a straightforward drop-in gasket that installs at the air silencer to carburetor joint during routine outboard maintenance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0933 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-0933 is a genuine Sierra part manufactured to meet or exceed original equipment specifications for Johnson\/Evinrude outboard motors.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086403291,"sku":"SIE-18-0933","price":4.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0933_lg__93983.1558120209.500.750.jpg?v=1785188793"},{"product_id":"marine-distributor-gasket-for-gm-v6-v8-omc-4-3l-8-2l-replaces-omc-312780-mercury-27-34486-3-sierra-18-0874-2-pack","title":"Sierra Distributor Gasket 18-0874-9, Replaces 16.50-00162, GM V-6 \u0026 V-8, Pack of 2","description":"\u003cp\u003eThe Sierra 18-0874-9 is a marine distributor gasket engineered to seal the distributor housing on GM V-6 and V-8 marine engines. It is sold in a pack of two, providing a spare for a future service or covering a job that calls for replacing gaskets on both sides of a dual application. As a distributor gasket, its primary job is to maintain a proper seal between the distributor base and the engine block, preventing oil seepage and helping keep ignition timing components free of contamination during operation. Installing a fresh gasket whenever the distributor is removed for service, timing adjustment, or replacement is standard practice, since a used gasket can lose its sealing properties once disturbed. The 18-0874-9 is a direct fit for GM V-6 and V-8 marine engine applications and cross-references to the OEM number 16.50-00162. Keeping a correct-fit gasket on hand simplifies routine ignition system maintenance and helps avoid oil leaks around the distributor base after reinstallation. This is a lightweight, low-cost component that is easy to keep in a parts inventory for scheduled maintenance or unexpected repairs.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0874-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Distributor Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e GM V-6 \u0026amp; V-8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e Pack of 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282161798\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 16.50-05756, 16.50-00162\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eGM V-6 \u0026amp; V-8 marine engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e16.50-05756\u003c\/li\u003e\n\u003cli\u003e16.50-00162\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0874-9 distributor gasket fit?\u003c\/strong\u003e The 18-0874-9 is designed for GM V-6 and V-8 marine engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one order of part 18-0874-9?\u003c\/strong\u003e This listing is a pack of 2 distributor gaskets, part number 18-0874-9.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-0874-9 gasket replace?\u003c\/strong\u003e It replaces OEM numbers 16.50-05756 and 16.50-00162.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0874-9 an OEM or aftermarket gasket?\u003c\/strong\u003e The 18-0874-9 is a Sierra-brand replacement gasket that cross-references to the OEM numbers 16.50-05756 and 16.50-00162, so it is an aftermarket equivalent rather than a factory-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0874-9 gasket weigh?\u003c\/strong\u003e Each pack of the 18-0874-9 distributor gasket weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the distributor gasket?\u003c\/strong\u003e The 18-0874-9 distributor gasket is round in shape, matching the distributor base it seals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the distributor gasket on my marine engine?\u003c\/strong\u003e Replace the 18-0874-9 gasket any time the distributor is removed from a GM V-6 or V-8 marine engine, since a disturbed gasket should not be reused.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need any other parts to install the 18-0874-9 gasket?\u003c\/strong\u003e The 18-0874-9 pack includes only the distributor gasket itself; no other components are included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-0874-9 gasket be used on a single-engine repair?\u003c\/strong\u003e Yes, since it comes as a pack of 2, one gasket from the 18-0874-9 pack can be used for a single repair with a spare left over.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the box with the 18-0874-9 part?\u003c\/strong\u003e The box contains 2 distributor gaskets, part number 18-0874-9, and no additional hardware.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086436059,"sku":"SIE-18-0874-9","price":3.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0874_lg__73723.1736969262.500.750.jpg?v=1785188101"},{"product_id":"sierra-18-0985-air-silencer-gasket-replaces-evinrude-johnson-321722-round-marine-outboard-gasket","title":"Sierra 18-0985 Air Silencer Gasket, Replaces Mallory 9-60417","description":"\u003cp\u003eThe Sierra 18-0985 Air Silencer Gasket is a round gasket built to meet or exceed original equipment quality for the air silencer assembly on applicable outboard engines. It seals the air silencer housing to help maintain proper airflow and prevent leaks at the joint, and it is manufactured to a consistent shape and fit so it installs in place of the original gasket without modification. This gasket is a cross-reference match for Mallory 9-60417, making it easy to identify and order the correct replacement even if you are used to shopping by the Mallory number. At just 0.07 pounds, it is a lightweight, simple wear item that is inexpensive to keep on hand for routine maintenance or when servicing the air silencer during a carburetor or intake job. Because fit is part-specific, confirm the part number against your existing gasket or engine documentation before ordering to ensure proper fit. Sierra backs this gasket with a limited warranty, and it ships as a single Included Component: one Air Silencer Gasket.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0985\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Air Silencer Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999752130\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999752130\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mallory 9-60417\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Gasket Sets\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFit-specific; verify against your existing part number before ordering.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMallory 9-60417\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0985 used for?\u003c\/strong\u003e The Sierra 18-0985 is an air silencer gasket that seals the air silencer housing on the applicable outboard engine, helping maintain a proper seal and airflow at that joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0985 gasket replace Mallory 9-60417?\u003c\/strong\u003e Yes, the Sierra 18-0985 Air Silencer Gasket is a direct cross-reference match for Mallory 9-60417.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket weigh?\u003c\/strong\u003e The Sierra 18-0985 Air Silencer Gasket weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the Sierra 18-0985 gasket?\u003c\/strong\u003e It is a round gasket, matching the shape of the air silencer housing it seals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0985 an OEM part or aftermarket?\u003c\/strong\u003e The 18-0985 is a Sierra-manufactured aftermarket gasket engineered to meet or exceed original equipment quality rather than a genuine OEM part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the package?\u003c\/strong\u003e The package includes one Air Silencer Gasket, part number 18-0985.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the 18-0985 fits my engine?\u003c\/strong\u003e Fit is part-specific, so compare the 18-0985 against your existing gasket or its Mallory 9-60417 cross-reference number before ordering to confirm proper fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra offer a warranty on the 18-0985 gasket?\u003c\/strong\u003e Yes, the Sierra 18-0985 Air Silencer Gasket is covered by Sierra's limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0985?\u003c\/strong\u003e The UPC for the Sierra 18-0985 Air Silencer Gasket is 030999752130.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this gasket be reused after removal?\u003c\/strong\u003e Gaskets like the 18-0985 are designed as a one-time seal, so it should be replaced with a new unit any time the air silencer housing is opened.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086567131,"sku":"SIE-18-0985","price":8.31,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0985_lg__74882.1558121478.500.750.jpg?v=1785188752"},{"product_id":"sierra-18-0965-adapter-outer-powerhead-gasket-replaces-omc-333879-fits-evinrude-johnson-outboards","title":"Sierra 18-0965 Adapter Outer Powerhead Gasket, Replaces 331598, Evinrude Outboard","description":"\u003cp\u003eThe Sierra 18-0965 is an Adapter Outer Powerhead Gasket engineered as a direct replacement for Evinrude outboard powerheads. This gasket seals the adapter-to-powerhead joint, helping maintain proper compression and preventing leaks at this critical connection point. Built to meet or exceed original equipment quality standards, it is designed as a drop-in replacement for the OEM number it references, making it a straightforward choice when servicing or rebuilding an Evinrude outboard powerhead. The gasket is finished in white and is supplied one per package, matching the original equipment quantity for this application. Because gaskets are wear items that lose their sealing ability over time from heat cycling and compression set, replacing the adapter outer powerhead gasket during any powerhead service or teardown helps restore a proper seal and reduce the risk of leaks or lost compression after reassembly. At 0.3 pounds, it ships and installs easily alongside other gasket set components during a routine powerhead rebuild.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0965\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Adapter Outer Powerhead Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Evinrude Outboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.3 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity per Package:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999752048\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eEvinrude outboard powerheads\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e331598\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-0965 used for?\u003c\/strong\u003e It is an Adapter Outer Powerhead Gasket that seals the adapter-to-powerhead joint on Evinrude outboard powerheads, part number 18-0965.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-0965 gasket fit Evinrude outboards?\u003c\/strong\u003e Yes, the Sierra 18-0965 Adapter Outer Powerhead Gasket is built for Evinrude outboard powerhead applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-0965 replace?\u003c\/strong\u003e The 18-0965 replaces OEM number 331598.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0965 gasket weigh?\u003c\/strong\u003e The Adapter Outer Powerhead Gasket 18-0965 weighs 0.3 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0965 gasket?\u003c\/strong\u003e The 18-0965 Adapter Outer Powerhead Gasket is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package of the 18-0965?\u003c\/strong\u003e One gasket is included per package for part number 18-0965.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0965 genuine OEM or aftermarket?\u003c\/strong\u003e The 18-0965 is an aftermarket Sierra part manufactured to meet or exceed the quality of the original equipment gasket it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the adapter outer powerhead gasket?\u003c\/strong\u003e Replace the 18-0965 gasket any time the powerhead is disassembled for service, since gaskets should not be reused once a joint has been broken.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-0965 seal properly against the original equipment part?\u003c\/strong\u003e Yes, the 18-0965 is designed as a direct-fit replacement for OEM number 331598 and is built to seal the same adapter-to-powerhead joint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the Sierra 18-0965?\u003c\/strong\u003e Ordering the 18-0965 includes the Adapter Outer Powerhead Gasket itself, one per package.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086632667,"sku":"SIE-18-0965","price":25.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0965_lg__43081.1558119798.500.750.jpg?v=1785188751"},{"product_id":"sierra-18-0989-air-silencer-gasket-for-evinrude-johnson-outboards-replaces-oem-321794","title":"Sierra 18-0989 Air Silencer Gasket, Replaces GLM 34430, Evinrude\/Johnson 321794, Mallory 9-60418","description":"\u003cp\u003eThe Sierra 18-0989 Air Silencer Gasket is a replacement gasket engineered to meet or exceed original equipment quality for outboard engines using this air silencer configuration. It is a direct cross-reference for GLM 34430, Evinrude\/Johnson 321794, and Mallory 9-60418, making it a straightforward drop-in replacement wherever one of those part numbers is called for. The gasket is finished in white and is built to seal reliably at the air silencer joint, helping maintain proper intake sealing and preventing air leaks that can affect engine performance.\u003c\/p\u003e\u003cp\u003eThis gasket is a fit-specific part, so buyers should confirm the part number against their existing hardware or a parts diagram before ordering to ensure proper fit. At 0.11 pounds, it ships as a lightweight, single-component gasket ready to install in place of a worn or damaged original.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0989\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Air Silencer Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.11 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999755704\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999755704\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Gasket Sets\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFit specific; check part numbers to ensure proper fit before ordering.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 34430\u003c\/li\u003e\n\u003cli\u003eEvinrude\/Johnson 321794\u003c\/li\u003e\n\u003cli\u003eMallory 9-60418\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-0989 Air Silencer Gasket replace?\u003c\/strong\u003e It cross-references to GLM 34430, Evinrude\/Johnson 321794, and Mallory 9-60418, so any of those part numbers can be replaced with Sierra 18-0989.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e Sierra 18-0989 is manufactured by Sierra and is built to meet or exceed the quality of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket weigh?\u003c\/strong\u003e The Sierra 18-0989 Air Silencer Gasket weighs 0.11 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-0989 gasket?\u003c\/strong\u003e It is finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket fit any outboard air silencer?\u003c\/strong\u003e No, Sierra 18-0989 is a fit-specific part, so buyers should check part numbers against their existing hardware before ordering to ensure proper fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this part?\u003c\/strong\u003e The order includes one Sierra 18-0989 Air Silencer Gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Evinrude\/Johnson 321794 gasket the same as the Sierra 18-0989?\u003c\/strong\u003e Yes, Evinrude\/Johnson 321794 is listed as an interchangeable equivalent to Sierra 18-0989.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Mallory 9-60418 gasket cross-reference to this Sierra part?\u003c\/strong\u003e Yes, Mallory 9-60418 is a direct cross-reference to Sierra 18-0989 Air Silencer Gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this gasket?\u003c\/strong\u003e The UPC for the Sierra 18-0989 Air Silencer Gasket is 030999755704.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need the 18-0989 gasket instead of another Sierra gasket?\u003c\/strong\u003e Match your existing part number against GLM 34430, Evinrude\/Johnson 321794, or Mallory 9-60418 to confirm that Sierra 18-0989 is the correct replacement.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086665435,"sku":"SIE-18-0989","price":9.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0989_lg__94581.1558121716.500.750.jpg?v=1785188517"},{"product_id":"sierra-18-0987-9-throttle-body-to-manifold-gasket-pack-of-2-replaces-evinrude-johnson-332319-evinrude-johnson-outboard","title":"Sierra 18-0987-9 Throttle Body to Manifold Gasket, Replaces 321479, Fits 25 \u0026 35 HP Outboards, Pack of 2","description":"\u003cp\u003eThe Sierra 18-0987-9 is a throttle body to manifold gasket for 25 HP and 35 HP outboard engines, sold as a pack of 2. This gasket seals the mating surface between the throttle body and the intake manifold, maintaining a proper air\/fuel seal at this connection. It is built to meet or exceed original equipment quality, making it a direct-fit replacement for the OEM gasket it supersedes.\u003c\/p\u003e\u003cp\u003eBecause it ships two to a pack, the 18-0987-9 covers a full gasket replacement plus a spare, or two separate jobs, without needing to order twice. Replacing this gasket during a throttle body service or manifold removal helps restore a tight seal and prevent air leaks that can affect engine performance. The part is identified by Sierra part number 18-0987-9 and directly replaces OEM part number 321479.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-0987-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Throttle Body to Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets per pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e 25 HP \u0026amp; 35 HP outboard engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282162245\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 321479\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e25 HP outboard engines\u003c\/li\u003e\n\u003cli\u003e35 HP outboard engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e321479\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-0987-9 gasket fit?\u003c\/strong\u003e The Sierra 18-0987-9 throttle body to manifold gasket fits 25 HP and 35 HP outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in this pack?\u003c\/strong\u003e Sierra 18-0987-9 is sold as a pack of 2 gaskets, not a single piece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-0987-9 replace?\u003c\/strong\u003e It directly replaces OEM part number 321479.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere does this gasket get installed?\u003c\/strong\u003e This gasket seals the mating surface between the throttle body and the intake manifold on 25 HP and 35 HP outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0987-9 an OEM part or aftermarket?\u003c\/strong\u003e It is an aftermarket gasket manufactured by Sierra to meet or exceed the quality of the original equipment part it replaces, OEM 321479.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket set weigh?\u003c\/strong\u003e The Sierra 18-0987-9 pack of 2 gaskets weighs 0.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this part?\u003c\/strong\u003e The UPC for Sierra 18-0987-9 is 808282162245.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use one gasket from the pack and save the other?\u003c\/strong\u003e Yes, Sierra 18-0987-9 ships two gaskets per pack, so one can be installed now and the second kept as a spare or used on a second engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-0987-9 fit engines other than 25 HP and 35 HP models?\u003c\/strong\u003e Sierra lists the 18-0987-9 gasket as fitting 25 HP and 35 HP outboard engines specifically.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy replace the throttle body to manifold gasket?\u003c\/strong\u003e Replacing the throttle body to manifold gasket, such as the Sierra 18-0987-9, restores the seal between these components and helps prevent leaks during throttle body or manifold service on 25 HP and 35 HP outboards.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086730971,"sku":"SIE-18-0987-9","price":8.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0987-9_lg__79815.1558121598.500.750.jpg?v=1785188937"},{"product_id":"sierra-18-1238-intake-gasket-set-replaces-volvo-penta-omc-3850379-912979-mercruiser-27-824326","title":"Sierra 18-1238 Intake Gasket Set, Replaces OMC\/Volvo Penta 912979, Mercury Marine 27-824326","description":"\u003cp\u003eThe Sierra 18-1238 Intake Gasket Set is a replacement gasket set designed to seal the intake manifold on compatible marine engines, restoring a tight seal where the original gasket has hardened, cracked, or begun to leak. Installed between the intake manifold and the engine block, the gasket set prevents air, fuel, and vacuum leaks that can cause rough idling, power loss, or coolant intrusion if the seal fails. The set is built to meet or exceed the specifications of the original equipment part it replaces, giving installers confidence that fit and sealing performance will match factory expectations. It ships as a single, complete unit (1 count) ready to install during an intake manifold service or full engine rebuild. This gasket set is cross-referenced to several OEM part numbers used across GLM, Evinrude\/Johnson, OMC, Mercury Marine, and Volvo Penta engines, making it a straightforward replacement for boat owners and marine mechanics who need to match an existing part number to the correct Sierra equivalent. Because it is sold as a defined set rather than a single gasket, it is intended to cover the full intake sealing job in one purchase rather than requiring multiple individual gaskets to be sourced separately.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1238\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Intake Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.35 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282239930\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e GLM 30351, Evinrude\/Johnson 912979, OMC 3850379, Mercury Marine 27-824326, Volvo Penta 912979, Volvo Penta 3850379\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eCompatible with engines that originally used GLM, Evinrude\/Johnson, OMC, Mercury Marine, or Volvo Penta intake gaskets carrying the OEM numbers listed above. Confirm your existing part number against the Replaces list below before ordering.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 30351\u003c\/li\u003e\n\u003cli\u003eEvinrude\/Johnson 912979\u003c\/li\u003e\n\u003cli\u003eOMC 3850379\u003c\/li\u003e\n\u003cli\u003eMercury Marine 27-824326\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 912979\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3850379\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-1238 Intake Gasket Set include?\u003c\/strong\u003e The Sierra 18-1238 Intake Gasket Set ships as a single complete set (1 count) containing the gaskets needed to reseal the intake manifold in one job, rather than requiring separate individual gasket purchases.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does part 18-1238 replace?\u003c\/strong\u003e Part 18-1238 cross-references to GLM 30351, Evinrude\/Johnson 912979, OMC 3850379, Mercury Marine 27-824326, Volvo Penta 912979, and Volvo Penta 3850379.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1238 gasket set equivalent to the original Mercury Marine 27-824326 part?\u003c\/strong\u003e Yes, Sierra 18-1238 is built to meet or exceed the specifications of the original equipment part it replaces, including Mercury Marine 27-824326.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1238 Intake Gasket Set weigh?\u003c\/strong\u003e The Sierra 18-1238 Intake Gasket Set weighs 0.35 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-1238 gasket set?\u003c\/strong\u003e This gasket set is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this gasket set be used on engines that originally used an OMC 3850379 gasket?\u003c\/strong\u003e Yes, OMC 3850379 is one of the OEM numbers that the Sierra 18-1238 Intake Gasket Set cross-references and replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the same part number work for Volvo Penta engines?\u003c\/strong\u003e Yes, Sierra 18-1238 cross-references to Volvo Penta 912979 and Volvo Penta 3850379, so it is a suitable replacement for engines that used those Volvo Penta gasket numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-1238 Intake Gasket Set is a genuine Sierra part, manufactured by Sierra and identified under Sierra part number 18-1238.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in the 18-1238 set?\u003c\/strong\u003e The Sierra 18-1238 is sold as one complete intake gasket set (unit count of 1) rather than as individual gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-1238 Intake Gasket Set?\u003c\/strong\u003e The UPC for this product is 808282239930.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket set fit an Evinrude\/Johnson engine that used gasket number 912979?\u003c\/strong\u003e Yes, Evinrude\/Johnson 912979 is listed as one of the OEM numbers replaced by Sierra 18-1238.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the GLM 30351 gasket and the Sierra 18-1238?\u003c\/strong\u003e GLM 30351 and Sierra 18-1238 are cross-referenced as equivalent parts, meaning Sierra 18-1238 is designed as a direct replacement for the GLM 30351 intake gasket.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988087124187,"sku":"SIE-18-1238","price":40.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1238_lg__68302.1558119574.500.750.jpg?v=1785188853"},{"product_id":"sierra-18-2430-9-drain-screw-gasket-5-pack-replaces-mercury-26-830749-fits-all-verado-outboards","title":"Sierra Drain Screw Gasket 18-2430-9, Replaces 26-830749, for Mercury Verado Outboards, 5-Pack","description":"\u003cp\u003eThe Sierra 18-2430-9 Drain Screw Gasket is a replacement sealing gasket designed for Mercury Verado outboard engines. Sold in a package of five, it is used to reseal the drain screw during oil changes or service on Verado outboards, restoring a proper seal and preventing leaks around the drain plug. Each gasket is built with marine grade materials to hold up to the marine engine environment. The part cross-references directly to O.E. Part Number 26-830749, making it a straightforward drop-in replacement when the original gasket is worn, compressed, or damaged during routine maintenance. Because it is sold in a 5-pack, it gives owners and shops enough gaskets on hand to cover several service intervals or multiple drain screw locations without reordering. As with any drain screw gasket, buyers should confirm the fitment against their specific Mercury Verado outboard before installation to ensure a proper seal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2430-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 5 gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Mercury Verado outboard engines (all)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 26-830749\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Marine grade material\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Verado outboard engines (all)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-830749\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2430-9 drain screw gasket fit?\u003c\/strong\u003e The Sierra 18-2430-9 is designed for Mercury Verado outboard engines (all), sealing the drain screw location on these engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e Each package of the 18-2430-9 contains five drain screw gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket replace an OEM part number?\u003c\/strong\u003e Yes, the 18-2430-9 replaces O.E. Part Number 26-830749.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is this gasket used for?\u003c\/strong\u003e It seals the drain screw on Mercury Verado outboard engines, typically replaced during oil changes or drain screw service to prevent leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2430-9 gasket made from?\u003c\/strong\u003e The Sierra 18-2430-9 drain screw gasket is built with marine grade material suited to the marine engine environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does a package of these gaskets weigh?\u003c\/strong\u003e A package of the Sierra 18-2430-9 drain screw gaskets weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket fit engines other than Mercury Verado?\u003c\/strong\u003e The Sierra 18-2430-9 is designated for Mercury Verado outboard engines (all); fitment to other engines is not specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2430-9 an aftermarket or genuine Sierra part?\u003c\/strong\u003e The 18-2430-9 is a Sierra manufactured replacement gasket, cross-referenced to O.E. Part Number 26-830749.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I replace the drain screw gasket every time I service the drain plug?\u003c\/strong\u003e Drain screw gaskets like the 18-2430-9 are typically replaced whenever the drain screw is removed, since a compressed or reused gasket can leak.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need the 18-2430-9 versus a different Sierra drain gasket?\u003c\/strong\u003e Confirm your engine is a Mercury Verado outboard before ordering the 18-2430-9, since drain screw gaskets vary by engine model and part number.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988106490075,"sku":"SIE-18-2430-9","price":15.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__89656.1753840674.500.750.jpg?v=1785188351"},{"product_id":"sierra-18-2519-9-seal-ring-pack-of-2-for-volvo-penta-cooling-water-pipe-replaces-831622-fits-aq120b-125a-140a-145a-171a","title":"Sierra Seal Ring 18-2519-9, Pack of 2, Replaces Volvo Penta 831891, Fits AQ120B AQ125A AQ125B AQ140A AQ145A AQ145B","description":"\u003cp\u003eThe Sierra Seal Ring 18-2519-9 is a rubber sealing ring engineered to meet or exceed original equipment quality for Volvo Penta marine engines. It is sold as a pack of 2, giving you a matched set for a complete service job rather than a single ring that leaves you short. The seal is designed as a direct equivalent to the Volvo Penta 831891 seal ring, making it a straightforward replacement part for routine maintenance or repair work on covered AQ-series engines. Made from rubber, the ring is built to hold a reliable seal against water and fluid intrusion in the areas it is fitted to. Because it ships as a 2-pack, it is well suited to jobs that call for replacing both rings at once, helping ensure a consistent, leak-free seal on both sides of the application. This part fits Volvo Penta AQ120B, AQ125A, AQ125B, AQ140A, AQ145A, and AQ145B engines. Always confirm your engine model against this fitment list before ordering to make sure you select the correct seal ring for your application.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2519-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack Quantity:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Seal Ring\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVolvo Penta AQ120B\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ125A\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ125B\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ140A\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ145A\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ145B\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eVolvo Penta 831891\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-2519-9 seal ring fit?\u003c\/strong\u003e The Sierra 18-2519-9 seal ring fits Volvo Penta AQ120B, AQ125A, AQ125B, AQ140A, AQ145A, and AQ145B engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part does the 18-2519-9 replace?\u003c\/strong\u003e It replaces Volvo Penta OEM part number 831891, making the Sierra 18-2519-9 a direct equivalent for that seal ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seal rings come in a pack?\u003c\/strong\u003e The Sierra 18-2519-9 is sold as a pack of 2 seal rings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the seal ring made from?\u003c\/strong\u003e The Sierra 18-2519-9 seal ring is made from rubber.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2519-9 seal ring weigh?\u003c\/strong\u003e Each package of the Sierra 18-2519-9 seal ring weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2519-9 an OEM or aftermarket part?\u003c\/strong\u003e It is an aftermarket Sierra replacement part manufactured to meet or exceed the original equipment quality of Volvo Penta part 831891.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I order just one seal ring instead of a pack?\u003c\/strong\u003e No, the Sierra 18-2519-9 is only available as a pack of 2 seal rings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this seal ring fit my Volvo Penta AQ165 engine?\u003c\/strong\u003e No, the Sierra 18-2519-9 is fitted to AQ120B, AQ125A, AQ125B, AQ140A, AQ145A, and AQ145B engines; other AQ-series engines use a different Sierra seal ring part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I purchase this part?\u003c\/strong\u003e Purchasing the Sierra 18-2519-9 gets you a pack of 2 rubber seal rings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm this is the right seal ring for my engine?\u003c\/strong\u003e Check that your engine model is one of AQ120B, AQ125A, AQ125B, AQ140A, AQ145A, or AQ145B, which are the confirmed fitments for the Sierra 18-2519-9 seal ring.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988107145435,"sku":"SIE-18-2519-9","price":10.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2519-9__50624.1737893655.500.750.jpg?v=1785188161"},{"product_id":"sierra-18-2541-water-pump-o-ring-seal-replaces-omc-johnson-evinrude-911704-omc-water-pump-repair","title":"Sierra 18-2541 O-Ring Rubber Seal, Replaces OEM 911704 and 984461","description":"\u003cp\u003eThe Sierra 18-2541 is a rubber O-ring seal engineered as a direct replacement for original equipment engine components. Molded from black rubber, it is built to meet or exceed the specifications of the original equipment part it replaces, providing a reliable seal against water and fluid intrusion in the engine application it serves. Its compact size and light weight of 0.01 pounds reflect its role as a precision internal sealing component rather than a structural part.\u003c\/p\u003e\u003cp\u003eEach unit is a single O-ring, sold individually, and is intended as a like-for-like replacement for an original equipment seal bearing the OEM number 911704. It is commonly stocked alongside other OMC internal engine parts and is used when servicing or rebuilding engine assemblies that call for this exact seal. Because it directly replaces the original equipment number, it drops into the same location without modification.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2541\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e O-Ring \/ Rubber Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 911704\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces:\u003c\/strong\u003e 984461\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999752833\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e911704\u003c\/li\u003e\n\u003cli\u003e984461\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2541?\u003c\/strong\u003e The Sierra 18-2541 is a black rubber O-ring seal used as a direct replacement engine sealing component, sold as a single individual unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-2541 replace?\u003c\/strong\u003e It replaces OEM numbers 911704 and 984461, so either of those original equipment numbers can be cross-referenced to the Sierra 18-2541.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2541 seal made from?\u003c\/strong\u003e It is made from black rubber, a material chosen for its flexibility and resistance to fluid exposure in engine sealing applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2541 O-ring weigh?\u003c\/strong\u003e The Sierra 18-2541 weighs 0.01 pounds, consistent with its role as a small internal sealing component rather than a structural part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2541 an aftermarket or genuine OEM part?\u003c\/strong\u003e The 18-2541 is an aftermarket replacement seal built to meet or exceed the specifications of the original equipment part it replaces, identified by OEM numbers 911704 and 984461.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many O-rings come in one 18-2541 package?\u003c\/strong\u003e One Sierra 18-2541 rubber seal is included per unit; quantity needed depends on how many seals the specific engine service calls for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2541 be used to service OMC internal engine components?\u003c\/strong\u003e Yes, the 18-2541 is categorized as an OMC internal engine part and is intended for use when servicing engine assemblies that require this seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2541 come in any color other than black?\u003c\/strong\u003e No, the Sierra 18-2541 rubber seal is produced in black only.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-2541 seal straightforward?\u003c\/strong\u003e As a direct-replacement O-ring for OEM numbers 911704 and 984461, the 18-2541 installs in the same location as the original seal without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-2541 and the original OEM seal?\u003c\/strong\u003e Functionally, the 18-2541 is designed to meet or exceed the original equipment seal's specifications; the difference is that it is sold under the Sierra brand rather than the original OEM part number.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988107538651,"sku":"SIE-18-2541","price":8.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2541_lg__68923.1558122845.500.750.jpg?v=1785188148"},{"product_id":"sierra-18-2857-9-air-silencer-gasket-pack-of-2-for-johnson-evinrude-outboards-replaces-386573-319771","title":"Sierra 18-2857-9 Air Silencer Gasket, Replaces 319771 386573, Johnson\/Evinrude Outboard, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2857-9 Air Silencer Gasket seals the air silencer housing on Johnson\/Evinrude outboard engines, preventing unmetered air leaks that can upset the carburetor's air\/fuel mixture and cause rough running or hard starting. Each package contains 2 gaskets, so buyers replacing both sides of a housing or keeping a spare on hand get exactly what they need in one purchase.\u003c\/p\u003e\u003cp\u003eSierra builds this gasket to precise O.E. Fitment using materials selected for durability under engine heat and vibration, so it seats correctly against the mating surfaces and holds a consistent seal over time. Because it is a direct-fit replacement for the OEM numbers it replaces, installation follows the same steps as removing and reinstalling the factory gasket, with no modification needed. It is backed by Sierra's manufacturer warranty.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2857-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Air Silencer Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e Pack of 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Other\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282163624\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Gasket Sets\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e319771\u003c\/li\u003e\n\u003cli\u003e386573\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2857-9 Air Silencer Gasket fit?\u003c\/strong\u003e The 18-2857-9 is designed for Johnson\/Evinrude outboard engines, sealing the air silencer housing to the carburetor or air box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e Sierra part 18-2857-9 is sold as a pack of 2 gaskets, covering both sides of the air silencer housing in one purchase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does this gasket replace?\u003c\/strong\u003e It replaces Johnson\/Evinrude OEM numbers 319771 and 386573.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2857-9 gasket genuine OEM or aftermarket?\u003c\/strong\u003e It is a Sierra-manufactured aftermarket gasket engineered for precise O.E. Fitment, not a Johnson\/Evinrude branded original part, but it is built to match the original sealing surfaces and dimensions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the air silencer gasket made from?\u003c\/strong\u003e The 18-2857-9 gasket is made from a gasket-grade material listed as 'Other,' selected by Sierra for reliable sealing under engine heat and vibration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2857-9 gasket weigh?\u003c\/strong\u003e Each package of the Sierra 18-2857-9 Air Silencer Gasket weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of this gasket straightforward?\u003c\/strong\u003e Yes, the 18-2857-9 is a direct replacement for the factory air silencer gasket, so it installs in the same position without modification when removing and reassembling the air silencer housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket come with a warranty?\u003c\/strong\u003e The Sierra 18-2857-9 Air Silencer Gasket is backed by Sierra's manufacturer warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the air silencer gasket?\u003c\/strong\u003e The 18-2857-9 gasket is round in shape.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill one package of 18-2857-9 be enough for a full air silencer rebuild?\u003c\/strong\u003e Each package contains 2 gaskets, which is typically enough for a complete air silencer housing seal, though buyers with multiple housings should order accordingly.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988132212955,"sku":"SIE-18-2857-9","price":6.67,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/sierra_lg_1255__59862.1558124433.500.750.jpg?v=1785188939"},{"product_id":"sierra-18-2876-9-bypass-cover-gasket-for-johnson-evinrude-outboards-replaces-omc-oem-307133-pack-of-2","title":"Sierra 18-2876-9 Bypass Cover Gasket, Replaces 307133, Johnson\/Evinrude Outboard - Pack of 2","description":"\u003cp\u003eThe Sierra 18-2876-9 is a bypass cover gasket built for Johnson and Evinrude outboard applications. It seals the bypass cover against the engine block or exhaust housing, preventing coolant or exhaust leakage at this joint during operation. Each Sierra 18-2876-9 is sold as a pack of 2 gaskets, so you have a spare on hand or enough to service two mating surfaces in the same job.\u003c\/p\u003e\u003cp\u003eSierra manufactures this gasket to meet or exceed the specification of the original equipment part it replaces, giving you a reliable, properly-fitting seal without sourcing a discontinued OEM number. It is designed as a direct fit for the Johnson and Evinrude outboard bypass cover location that uses OEM part 307133, making it a straightforward drop-in replacement during a bypass cover service, water pump job, or general gasket set refresh.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2876-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Bypass Cover Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets per pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Johnson and Evinrude outboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282163815\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00808282163815\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson and Evinrude outboard applications\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e307133\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2876-9 bypass cover gasket fit?\u003c\/strong\u003e The Sierra 18-2876-9 is designed for Johnson and Evinrude outboard applications, sealing the bypass cover on these engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a pack of the 18-2876-9?\u003c\/strong\u003e Each pack of the Sierra 18-2876-9 bypass cover gasket contains 2 gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2876-9 a direct replacement for OEM part 307133?\u003c\/strong\u003e Yes, the Sierra 18-2876-9 replaces OEM number 307133 on applicable Johnson and Evinrude outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2876-9 bypass cover gasket weigh?\u003c\/strong\u003e The Sierra 18-2876-9 bypass cover gasket weighs 0.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra make this gasket to OEM quality standards?\u003c\/strong\u003e Sierra states that the 18-2876-9 bypass cover gasket meets or exceeds the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2876-9 genuine Sierra or aftermarket?\u003c\/strong\u003e The 18-2876-9 is manufactured by Sierra International as a replacement gasket, not a genuine Johnson\/Evinrude OEM part, though it is designed to match OEM fit and function.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2876-9 bypass cover gasket?\u003c\/strong\u003e The UPC for the Sierra 18-2876-9 bypass cover gasket is 808282163815.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace the bypass cover gasket on my outboard?\u003c\/strong\u003e A bypass cover gasket like the Sierra 18-2876-9 should be replaced whenever the bypass cover is removed for service, such as during a water pump or cooling system job, to ensure a proper seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I buy just one 18-2876-9 gasket instead of a pack of 2?\u003c\/strong\u003e The Sierra 18-2876-9 is sold as a pack of 2 gaskets and is not offered as a single unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of part is the Sierra 18-2876-9?\u003c\/strong\u003e The Sierra 18-2876-9 is a bypass cover gasket, part of Sierra's Evinrude outboard gasket offerings.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988132442331,"sku":"SIE-18-2876-9","price":3.96,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2876-9__09387.1722513800.500.750.jpg?v=1785188496"},{"product_id":"sierra-18-2880-9-cover-plate-gasket-replaces-oem-304023-for-johnson-evinrude-v-4-outboards-pack-of-2","title":"Sierra 18-2880-9 Cover Plate Gasket, Replaces 304023, Johnson\/Evinrude Applications, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2880-9 Cover Plate Gasket is a round gasket built for Johnson and Evinrude outboard applications, sold as a package of two so you have a spare or can service both sides of a job in one purchase. It seals the cover plate against leaks at the mating surface, restoring a tight fit after the original gasket has hardened, torn, or compressed with age. Sierra manufactures this gasket to meet or exceed the specifications of the original equipment part it replaces, giving installers a reliable, drop-in alternative to the OEM component without hunting down a discontinued factory part.\u003c\/p\u003e\u003cp\u003eBecause it is a low-cost wear item, the Cover Plate Gasket is commonly replaced any time the cover plate is removed for service, since reusing an old gasket risks a leak. The pack-of-two format makes it practical to keep a spare on hand or to service a pair of engines or covers in a single order.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2880-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Cover Plate Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Johnson and Evinrude outboard engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282163853\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 304023\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Johnson and Evinrude outboard applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e304023\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2880-9 Cover Plate Gasket fit?\u003c\/strong\u003e This gasket is designed for Johnson and Evinrude outboard applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package?\u003c\/strong\u003e The 18-2880-9 is sold as a package of two cover plate gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-2880-9 replace?\u003c\/strong\u003e It replaces Johnson\/Evinrude part number 304023.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket weigh?\u003c\/strong\u003e The Sierra 18-2880-9 Cover Plate Gasket weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the cover plate gasket?\u003c\/strong\u003e It is a round gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2880-9 an OEM part or aftermarket?\u003c\/strong\u003e It is a Sierra aftermarket gasket manufactured to meet or exceed the specifications of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace this gasket?\u003c\/strong\u003e Any time the cover plate on a Johnson or Evinrude outboard is removed for service, since reusing a hardened or torn gasket risks a leak; the 18-2880-9 provides a fresh replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with part number 18-2880-9?\u003c\/strong\u003e Two Cover Plate Gaskets are included in each package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra make this gasket for other outboard brands?\u003c\/strong\u003e The 18-2880-9 is designated for Johnson and Evinrude applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2880-9 gasket?\u003c\/strong\u003e The UPC is 808282163853.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988132737243,"sku":"SIE-18-2880-9","price":6.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2880-9__62332.1737843459.500.750.jpg?v=1785188168"},{"product_id":"bearing-housing-gasket-for-evinrude-outboards-sierra-18-2891-replaces-omc-303339","title":"Sierra Bearing Housing Gasket 18-2891, Replaces 324937 and 303339, Evinrude 6 HP, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2891 Bearing Housing Gasket is a replacement gasket engineered for the bearing housing on Evinrude 6 HP outboard motors. It is sold as a package of 2, giving boat owners and technicians a spare on hand for the next service interval or a second unit for a shop stocking multiple repairs. The gasket seals the bearing housing to prevent water intrusion and maintain proper lubrication at the mating surface, a common failure point that leads to water contamination or oil loss if the old gasket has hardened, cracked, or lost its seal over time.\u003c\/p\u003e\u003cp\u003eThis gasket is part of Sierra's Evinrude Outboard Gasket Sets line, built to match OEM dimensions and material specifications so it seats correctly against the original bearing housing without additional trimming or fitting. Because it directly replaces Evinrude part numbers 324937 and 303339, it is a straightforward drop-in swap during a bearing housing service, water pump job, or lower unit rebuild on compatible 6 HP Evinrude outboards.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2891\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Bearing Housing Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999313980\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Evinrude 6 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 324937, 303339\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eEvinrude 6 HP outboard motors\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e324937\u003c\/li\u003e\n\u003cli\u003e303339\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2891 gasket fit?\u003c\/strong\u003e The Sierra 18-2891 Bearing Housing Gasket is designed for Evinrude 6 HP outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-2891 replace OEM part 324937?\u003c\/strong\u003e Yes, Sierra 18-2891 is a direct replacement for Evinrude OEM part number 324937.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-2891 also replace OEM part 303339?\u003c\/strong\u003e Yes, this bearing housing gasket also replaces Evinrude OEM part number 303339.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package of 18-2891?\u003c\/strong\u003e Each package of the Sierra 18-2891 Bearing Housing Gasket contains 2 gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2891 gasket weigh?\u003c\/strong\u003e The Sierra 18-2891 Bearing Housing Gasket weighs 0.02 pounds per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2891 gasket a genuine Sierra part?\u003c\/strong\u003e Yes, 18-2891 is a genuine Sierra Bearing Housing Gasket manufactured to fit Evinrude 6 HP outboards as a direct replacement for OEM numbers 324937 and 303339.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace the bearing housing gasket on my Evinrude 6 HP?\u003c\/strong\u003e A bearing housing gasket like the Sierra 18-2891 should be replaced any time the bearing housing is removed for service, such as during a lower unit rebuild or water pump repair, or if the old gasket shows signs of hardening or cracking.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with the Sierra 18-2891 purchase?\u003c\/strong\u003e Purchasing the Sierra 18-2891 includes a package of 2 Bearing Housing Gaskets for Evinrude 6 HP outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 18-2891 on outboards other than the Evinrude 6 HP?\u003c\/strong\u003e The Sierra 18-2891 Bearing Housing Gasket is specified for Evinrude 6 HP outboard motors; fitment on other models is not confirmed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2891 gasket?\u003c\/strong\u003e The Sierra 18-2891 Bearing Housing Gasket carries UPC 030999313980.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988132802779,"sku":"SIE-18-2891","price":3.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2891_lg__47027.1709562521.500.750.jpg?v=1785329151"},{"product_id":"sierra-18-2939-rubber-seal-for-volvo-penta-water-pickup-connection-replaces-814356-fits-aq200-250-270-275-280-290-pack-of-2","title":"Sierra Rubber Seal 18-2939, Replaces 814356, Fits Volvo Penta AQ200\/250\/270\/275\/280\/290, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2939 is a rubber seal used at the water pump connection on select Volvo Penta AQ series sterndrive engines. It creates a watertight seal at the pickup\/connection point in the raw water cooling circuit, helping prevent leaks and water intrusion that can lead to corrosion or reduced cooling performance. Made from rubber for flexibility and resistance to the marine water environment, this seal is a low-cost, high-frequency maintenance item that should be replaced any time the water pump connection is disassembled for service, or as part of routine cooling system maintenance. It is sold as a package of 2, so buyers have a spare on hand or enough for both connection points in a single service job. This seal directly replaces OEM part number 814356 and is designed to fit Volvo Penta AQ200, AQ250, AQ270, AQ275, AQ280, and AQ290 engines. Installing the correct rubber seal at this connection point is a simple but important step in keeping the raw water cooling system sealed and functioning properly, and using the Sierra 18-2939 ensures a fit and material equivalent to the original equipment part.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2939\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Rubber Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Water Pump Connector\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.05 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 814356\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eVolvo Penta AQ200\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ250\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ270\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ275\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ280\u003c\/li\u003e\n\u003cli\u003eVolvo Penta AQ290\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e814356\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2939 rubber seal used for?\u003c\/strong\u003e The Sierra 18-2939 is a rubber seal that fits at the water pump connection on Volvo Penta AQ series sterndrive engines, sealing the raw water cooling circuit at that connection point to prevent leaks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Volvo Penta engines does the 18-2939 seal fit?\u003c\/strong\u003e This rubber seal is designed to fit Volvo Penta AQ200, AQ250, AQ270, AQ275, AQ280, and AQ290 engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2939 replace OEM part 814356?\u003c\/strong\u003e Yes, Sierra part number 18-2939 directly replaces OEM number 814356.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in a package?\u003c\/strong\u003e The Sierra 18-2939 rubber seal is sold as a package of 2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2939 seal made from?\u003c\/strong\u003e It is made from rubber, chosen for its flexibility and ability to hold a watertight seal in the marine cooling environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2939 rubber seal weigh?\u003c\/strong\u003e The package weighs 0.05 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this rubber seal be replaced?\u003c\/strong\u003e The 18-2939 should be replaced any time the water pump connection on a compatible Volvo Penta AQ engine is disassembled for service, or when the existing seal shows signs of hardening, cracking, or leaking.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2939 an OEM or aftermarket part?\u003c\/strong\u003e The 18-2939 is a Sierra aftermarket rubber seal manufactured to replace OEM part 814356 on the applicable Volvo Penta AQ engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when ordering the 18-2939?\u003c\/strong\u003e Ordering the 18-2939 provides a package of 2 rubber seals for the water pump connection on compatible Volvo Penta AQ engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill one 18-2939 package be enough for a full water pump connector service?\u003c\/strong\u003e Since the 18-2939 ships as a pack of 2, most single-engine water pump connector services on a Volvo Penta AQ200-AQ290 engine can be completed with one package.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988133228763,"sku":"SIE-18-2939","price":11.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2939_lg__84350.1558123871.500.750.jpg?v=1785189081"},{"product_id":"sierra-18-29451-9-drain-screw-gasket-50-pack-for-honda-bf8-bf9-9-outboards-fits-18-2244-drain-screw","title":"Sierra 18-29451-9 Drain Screw Gasket, 50-Pack, Replaces 12-20260, F8077, F8186, for Lower Units and Sea Water Pumps","description":"\u003cp\u003eThe Sierra 18-29451-9 Drain Screw Gasket is a replacement sealing gasket sold in a pack of 50, designed for use with Sierra's 18-2944 Drain Screw. It is used in most lower units and sea water pumps, where it seals the drain screw against water and gear lube leakage during service and maintenance. The gasket is round in shape, finished in white, and built with marine grade materials to withstand exposure to water and lubricants inside the lower unit and pump housing. Because drain and fill screws are removed routinely during gear lube changes and winterization, the gasket underneath should be replaced each time rather than reused, and having a 50-count pack on hand means a fresh gasket is always available for the next service interval. This part is cataloged as a Johnson Outboard Gasket Set item, reflecting its common use across Johnson-family lower unit and pump service. Always confirm the drain screw and housing dimensions on your unit match before installing, since gaskets are sized to a specific screw.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-29451-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Drain Screw Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 50 gaskets per pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Marine grade material\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.5 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned For Use With:\u003c\/strong\u003e Sierra 18-2944 Drain Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Used in most lower units and sea water pumps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Johnson Outboard Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282180362\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eUsed in most lower units and sea water pumps; designed for use with the Sierra 18-2944 Drain Screw\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e12-20260\u003c\/li\u003e\n\u003cli\u003e12-19183\u003c\/li\u003e\n\u003cli\u003e12-191832\u003c\/li\u003e\n\u003cli\u003e12-191833\u003c\/li\u003e\n\u003cli\u003eF50556\u003c\/li\u003e\n\u003cli\u003eF8077\u003c\/li\u003e\n\u003cli\u003eF8186\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-29451-9 gasket used for?\u003c\/strong\u003e It is a drain screw gasket used in most lower units and sea water pumps, sealing the drain screw threads to prevent leaks after service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a pack?\u003c\/strong\u003e The 18-29451-9 pack contains 50 drain screw gaskets, enough for many service intervals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich drain screw does this gasket fit?\u003c\/strong\u003e This gasket is designed for use with Sierra's 18-2944 Drain Screw.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-29451-9 gasket replace?\u003c\/strong\u003e It replaces OEM numbers 12-20260, 12-19183, 12-191832, 12-191833, F50556, F8077, and F8186.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the gasket made from?\u003c\/strong\u003e The Sierra 18-29451-9 gasket is built with marine grade material suited to sealing against water and gear lube exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and shape is this gasket?\u003c\/strong\u003e It is round in shape and white in color.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does a pack weigh?\u003c\/strong\u003e A pack of 50 Sierra 18-29451-9 gaskets weighs 0.5 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould the drain screw gasket be reused after removing the drain screw?\u003c\/strong\u003e No; a new gasket should be installed each time the drain screw is removed, which is why the 18-29451-9 is sold in a 50-pack for repeated service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part?\u003c\/strong\u003e Yes, part number 18-29451-9 is a genuine Sierra drain screw gasket, not a generic aftermarket substitute.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the package?\u003c\/strong\u003e The package includes 50 drain screw gaskets and nothing else; the drain screw itself (18-2944) is sold separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket fit any lower unit or sea water pump?\u003c\/strong\u003e The 18-29451-9 gasket is used in most lower units and sea water pumps, but fit should be confirmed against your specific drain screw before ordering.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135260379,"sku":"SIE-18-29451-9","price":44.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Sierra_18-29451-9_Drain_Screw_Gasket_50Pk__90465.1558336162.500.750.jpg?v=1785188391"},{"product_id":"seal-ring-gasket-quad-ring-replaces-26-45577-for-mercruiser-r-mr-alpha-bravo-sterndrives-sierra-18-2944-9-pack-of-2","title":"Sierra 18-2944-9 Seal Ring Gasket - Fits R, MR, Alpha and Bravo Drives - Pack of 2","description":"\u003cp\u003eThe Sierra 18-2944-9 is a seal ring gasket sold in a pack of two, designed as a round quad-ring seal for marine sterndrive applications. It fits R, MR, Alpha, and Bravo drives, making it a common replacement item for boat owners servicing their outdrive housing. The quad ring shape provides a reliable seal against water and fluid intrusion at the drive interface, helping prevent leaks that can lead to corrosion or lubricant loss.\u003c\/p\u003e\u003cp\u003eEach pack contains two seal rings, allowing for a complete service on both mating surfaces or providing a spare for future maintenance. As a Sierra part, it is built to match OEM fit and function for the drives it is designated for. The compact, lightweight design (0.01 pounds per pack) makes it an inexpensive but important part of routine outdrive maintenance, and it is identified by UPC 808282164317 for easy verification when ordering.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2944-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Volvo Penta Timing Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e Pack of 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e R, MR, Alpha and Bravo drives\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282164317\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00808282164317\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eR drives\u003c\/li\u003e\n\u003cli\u003eMR drives\u003c\/li\u003e\n\u003cli\u003eAlpha drives\u003c\/li\u003e\n\u003cli\u003eBravo drives\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2944-9 seal ring gasket used for?\u003c\/strong\u003e It is a seal ring gasket used at the outdrive housing to seal against water and fluid intrusion, and the Sierra 18-2944-9 is sold in a pack of two for this purpose.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat drives does the 18-2944-9 fit?\u003c\/strong\u003e The Sierra 18-2944-9 fits R, MR, Alpha, and Bravo drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seal rings come in one package?\u003c\/strong\u003e One package of part number 18-2944-9 contains two seal ring gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the Sierra 18-2944-9 seal ring?\u003c\/strong\u003e It is a round seal ring, consistent with a quad-ring style seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does a pack of the 18-2944-9 weigh?\u003c\/strong\u003e A pack of the Sierra 18-2944-9 seal ring gasket weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2944-9 a genuine Sierra part?\u003c\/strong\u003e Yes, part number 18-2944-9 is manufactured and sold by Sierra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2944-9?\u003c\/strong\u003e The UPC for this seal ring gasket pack is 808282164317.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I buy the 18-2944-9 as a single seal ring?\u003c\/strong\u003e No, the Sierra 18-2944-9 is sold only as a pack of two seal rings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-2944-9 fit Alpha One or Bravo outdrives?\u003c\/strong\u003e Yes, the 18-2944-9 is listed as fitting Alpha and Bravo drives, along with R and MR drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of seal is included with part number 18-2944-9?\u003c\/strong\u003e The pack includes quad ring style seal rings under Sierra part number 18-2944-9.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135293147,"sku":"SIE-18-2944-9","price":4.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2944-9__64069.1737871532.500.750.jpg?v=1785188247"},{"product_id":"sierra-18-2945-9-marine-drain-screw-gasket-2-pack-fits-3-8-16-drain-fill-screw-replaces-mercury-mercruiser-12-19183-12-20260","title":"Sierra 18-2945-9 Drain Screw Gasket for 3\/8-16 Drain and Fill Screws, Replaces 307552, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2945-9 Drain Screw Gasket is a replacement gasket sized for the 3\/8-16 drain and fill screw found on most lower units and sea water pumps, including the drain\/fill screw used on all MerCruiser sterndrives and most Mercury\/Mariner outboards. It is sold as a pack of 2 gaskets, giving you a matched set for a complete drain\/fill screw service without needing to source individual pieces separately.\u003c\/p\u003e\u003cp\u003eBuilt from stainless steel with a machined finish, this gasket is designed to create a reliable seal against water and lubricant leakage at the drain screw location, helping protect the lower unit or sea water pump from moisture intrusion and gear lube loss. Because the fit is specific to the 3\/8-16 drain screw size, it is important to confirm your screw and housing match this specification before ordering.\u003c\/p\u003e\u003cp\u003eThis gasket carries the Sierra part number 18-2945-9 and directly replaces the original equipment gasket bearing the number 307552, so it is a straightforward drop-in replacement during routine gear lube changes or drain screw servicing.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2945-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e Pack of 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFastener Size:\u003c\/strong\u003e 3\/8-16\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 4 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 4 x 4 x 1 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Groove Diameter:\u003c\/strong\u003e 0.38 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282164324\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUsed with the 3\/8-16 drain\/fill screw found on all MerCruiser sterndrives and most Mercury\/Mariner outboards\u003c\/li\u003e\n\u003cli\u003eFits most lower units and sea water pumps\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e307552\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat size drain screw does the Sierra 18-2945-9 gasket fit?\u003c\/strong\u003e The Sierra 18-2945-9 Drain Screw Gasket is sized for a 3\/8-16 drain and fill screw, the size found on all MerCruiser sterndrives and most Mercury\/Mariner outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a pack?\u003c\/strong\u003e This listing is for the Sierra 18-2945-9 gasket sold as a pack of 2, giving you a matched pair for a drain and fill screw service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does this gasket replace?\u003c\/strong\u003e Part number 18-2945-9 replaces OEM number 307552.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-2945-9 gasket made from?\u003c\/strong\u003e Stainless steel with a machined finish, chosen for corrosion resistance in marine drain and fill screw applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this gasket fit my lower unit or sea water pump?\u003c\/strong\u003e Yes, as long as the drain or fill screw uses the 3\/8-16 thread size, since the Sierra 18-2945-9 gasket is designed to fit most lower units and sea water pumps with that screw size.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2945-9 gasket compatible with MerCruiser sterndrives?\u003c\/strong\u003e It is compatible with all MerCruiser sterndrives that use the 3\/8-16 drain\/fill screw, along with most Mercury\/Mariner outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I install the drain screw gasket?\u003c\/strong\u003e Remove the old drain or fill screw and gasket, place a new Sierra 18-2945-9 gasket on the screw, and reinstall the screw into the lower unit or sea water pump housing to seal the drain point.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the outer dimensions of this gasket?\u003c\/strong\u003e The Sierra 18-2945-9 gasket has an outside diameter of 4 inches and item dimensions of 4 x 4 x 1 inches, with a compatible groove diameter of 0.38 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this part weigh?\u003c\/strong\u003e The Sierra 18-2945-9 Drain Screw Gasket pack weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e It is a Sierra branded part, number 18-2945-9, manufactured to meet or exceed the specification of the original drain screw gasket it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use this gasket on Mercury or Mariner outboards?\u003c\/strong\u003e Yes, the 3\/8-16 drain\/fill screw gasket configuration used on the Sierra 18-2945-9 fits most Mercury and Mariner outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this part?\u003c\/strong\u003e Ordering part number 18-2945-9 gets you a pack of 2 stainless steel drain screw gaskets, sized for a 3\/8-16 drain or fill screw.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988135358683,"sku":"SIE-18-2945-9","price":1.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2945-9__72257.1737822229.500.750.jpg?v=1785188520"},{"product_id":"sierra-18-3329-grommet-replaces-omc-evinrude-johnson-302497-glm-86492-mallory-9-43603","title":"Sierra Grommet 18-3329, Replaces OMC\/Evinrude Johnson 302497","description":"\u003cp\u003eThe Sierra 18-3329 is a machined marine grommet engineered to meet or exceed original equipment quality. It is designed as a direct replacement for OMC\/Evinrude Johnson part number 302497, making it a straightforward swap when the original grommet on your outboard has hardened, cracked, or gone missing during a rebuild or routine maintenance. Grommets like this one are used to seal small openings and protect wiring, fasteners, or fittings from water intrusion, so keeping this component in good condition helps preserve the integrity of the surrounding assembly.\u003c\/p\u003e\u003cp\u003eThe Sierra 18-3329 measures 0.39 x 0.39 x 0.39 inches and weighs 0.01 pounds, making it a compact, precision-machined component sold as an individual piece. Because it is sized and manufactured to match OMC\/Evinrude Johnson specifications, it installs the same way the original part did, with no modification required.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3329\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Grommet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999875440\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold As:\u003c\/strong\u003e Individual piece\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC\/Evinrude Johnson 302497\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3329 grommet replace?\u003c\/strong\u003e The Sierra 18-3329 is a direct replacement for OMC\/Evinrude Johnson part number 302497.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-3329 grommet?\u003c\/strong\u003e This grommet measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3329 weigh?\u003c\/strong\u003e It weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3329 sold individually or in a pack?\u003c\/strong\u003e The 18-3329 grommet is sold as an individual piece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the Sierra 18-3329 grommet have?\u003c\/strong\u003e It has a machined finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-3329 fit if my original part is stamped 302497?\u003c\/strong\u003e Yes, part number 302497 is the OMC\/Evinrude Johnson number that the Sierra 18-3329 directly replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3329 an OEM part or aftermarket?\u003c\/strong\u003e The 18-3329 is a Sierra-manufactured aftermarket grommet built to meet or exceed the quality of the original equipment part it replaces, OMC\/Evinrude Johnson 302497.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3329 grommet?\u003c\/strong\u003e The UPC for the Sierra 18-3329 grommet is 030999875440.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the Sierra 18-3329 be used during an outboard rebuild?\u003c\/strong\u003e Yes, this grommet is commonly replaced during rebuilds or routine maintenance when the original 302497 grommet has hardened or cracked.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3329 require modification to install?\u003c\/strong\u003e No, since it is machined to match the OMC\/Evinrude Johnson 302497 specifications, it installs the same way the original grommet did.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988144238811,"sku":"SIE-18-3329","price":3.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3329_lg__08003.1558124857.500.750.jpg?v=1785188455"},{"product_id":"water-cover-gasket-for-johnson-evinrude-20-35-hp-outboards-replaces-oem-327674-sierra-18-3899","title":"Sierra 18-3899 Water Cover Gasket for Johnson\/Evinrude 20, 25, 25C, 30, 35 HP Outboards","description":"\u003cp\u003eThe Sierra 18-3899 Water Cover Gasket is a round gasket engineered to seal the water cover on Johnson\/Evinrude outboard motors rated 20, 25, 25C, 30, and 35 HP. It creates a reliable seal between the water cover and powerhead, helping maintain proper cooling system integrity and preventing water intrusion or leaks at the cover joint. As a Sierra Marine product, it is built to meet or exceed the specifications of the original equipment part it replaces, giving boat owners a dependable option when servicing the outboard's cooling passages during a rebuild or routine maintenance.\u003c\/p\u003e\u003cp\u003eThis is a single-piece gasket (one gasket per package) intended for direct fitment on the applicable Johnson\/Evinrude horsepower range. Sierra supplies OEM engine manufacturers and boat builders with quality parts daily, and every Sierra part is backed by Sierra's customer satisfaction warranty.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3899\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Water Cover Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282244118\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude outboards: 20, 25, 25C, 30, 35 HP\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3899 gasket used for?\u003c\/strong\u003e The Sierra 18-3899 is a water cover gasket that seals the water cover on Johnson\/Evinrude outboard motors, helping maintain a proper seal in the cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich outboard motors does the 18-3899 gasket fit?\u003c\/strong\u003e It fits Johnson\/Evinrude outboards rated 20, 25, 25C, 30, and 35 HP.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in one package?\u003c\/strong\u003e Each package of part number 18-3899 contains one water cover gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the 18-3899 water cover gasket?\u003c\/strong\u003e The gasket is round in shape, matching the water cover it is designed to seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3899 gasket weigh?\u003c\/strong\u003e The Sierra 18-3899 water cover gasket weighs 0.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3899 an OEM or aftermarket part?\u003c\/strong\u003e It is a Sierra aftermarket part engineered to meet or exceed the specifications of the original equipment water cover gasket it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3899 gasket come with a warranty?\u003c\/strong\u003e Yes, the 18-3899 is covered under Sierra's customer satisfaction warranty like all Sierra parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this water cover gasket?\u003c\/strong\u003e This gasket should be replaced any time the water cover is removed for service or if the existing gasket shows signs of leaking or deterioration on a Johnson\/Evinrude 20-35 HP outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3899 gasket?\u003c\/strong\u003e The UPC for the Sierra 18-3899 water cover gasket is 808282244118.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3899 gasket compatible with the 25C model specifically?\u003c\/strong\u003e Yes, the 25C horsepower variant is included in the listed fitment for the Sierra 18-3899 water cover gasket, along with the 20, 25, 30, and 35 HP models.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988169928923,"sku":"SIE-18-3899","price":8.13,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3899_lg__55307.1558127584.500.750.jpg?v=1785188650"},{"product_id":"sierra-18-3910-piston-ring-for-johnson-evinrude-25-35-hp-60-75-hp-outboards-oem-396377-standard-bore-3-000-in","title":"Sierra 18-3910 Piston Ring, Replaces OMC 396377, for Johnson\/Evinrude 25-35 HP 2-Cyl and 60-75 HP 3-Cyl Outboards, 3.000 Inch Standard Bore","description":"\u003cp\u003eThe Sierra 18-3910 is a piston ring built for Johnson and Evinrude outboard motors, sized for a 3.000 inch standard bore. It is designed to replace OEM part number 396377 and is machined to match or exceed the fit, seal, and performance of the original equipment ring it replaces. This ring is used in two distinct outboard applications: 25-35 HP models with a 2-cylinder configuration, and 60-75 HP models with a 3-cylinder configuration, both sharing the same 3.000 inch standard bore size and the same 396377 OEM cross-reference. Because piston rings maintain the compression seal between the piston and cylinder wall, using a correctly sized, precision-machined ring is important for restoring proper compression and preventing blow-by after a rebuild or when replacing worn rings. The 18-3910 is sold to be installed as part of a piston ring set during an engine rebuild or top-end service on the applicable Johnson\/Evinrude powerheads. Confirm your engine's horsepower rating, cylinder count, and bore size against the fitment details below before ordering, since piston rings are precision-fit components and the wrong bore size will not seal correctly.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3910\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999542755\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Inline Piston \u0026amp; Rings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e 3.000 inches, standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Configuration:\u003c\/strong\u003e 2-cylinder and 3-cylinder applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 396377\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment - Horsepower:\u003c\/strong\u003e 25-35 HP (2-cylinder), 60-75 HP (3-cylinder)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eJohnson\/Evinrude 25-35 HP, 2-cylinder, 3.000 inch standard bore\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude 60-75 HP, 3-cylinder, 3.000 inch standard bore\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e396377\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat outboard motors does the Sierra 18-3910 piston ring fit?\u003c\/strong\u003e The Sierra 18-3910 fits Johnson\/Evinrude outboards in two configurations: 25-35 HP models with a 2-cylinder engine, and 60-75 HP models with a 3-cylinder engine. Both share a 3.000 inch standard bore size.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-3910 replace?\u003c\/strong\u003e It replaces OEM part number 396377. The Sierra 18-3910 is machined to match the fit and performance of that original equipment piston ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat bore size is the Sierra 18-3910 ring designed for?\u003c\/strong\u003e This ring is sized for a 3.000 inch standard bore, not an oversized bore, so it is intended for cylinders that have not been bored out.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3910 a single ring or a full ring set?\u003c\/strong\u003e The Sierra 18-3910 is listed and sold as a piston ring for the applicable Johnson\/Evinrude cylinder; confirm quantity needed per piston when ordering for a full rebuild.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3910 piston ring weigh?\u003c\/strong\u003e The Sierra 18-3910 weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-3910?\u003c\/strong\u003e The Sierra 18-3910 measures approximately 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3910 work on both 2-cylinder and 3-cylinder Johnson\/Evinrude engines?\u003c\/strong\u003e Yes. The same Sierra 18-3910 part number is used for the 25-35 HP 2-cylinder application and the 60-75 HP 3-cylinder application, since both use a 3.000 inch standard bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3910 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-3910 is a Sierra-branded replacement part manufactured to replace OEM number 396377, not an original Johnson\/Evinrude branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-3910 piston ring have?\u003c\/strong\u003e The Sierra 18-3910 has a machined finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need the standard bore ring or an oversized ring?\u003c\/strong\u003e The 18-3910 is the standard 3.000 inch bore version; if your cylinder has been bored oversize, you need a different part number sized for that oversize bore rather than the 18-3910.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat horsepower range covers the 18-3910 on a 2-cylinder engine versus a 3-cylinder engine?\u003c\/strong\u003e On a 2-cylinder engine the 18-3910 covers the 25-35 HP range, while on a 3-cylinder engine it covers the 60-75 HP range.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988170027227,"sku":"SIE-18-3910","price":35.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3910__56492.1739458769.500.750.jpg?v=1785188151"},{"product_id":"sierra-18-3937-piston-ring-set-std-bore-replaces-mercruiser-39-17464-mercruiser-omc-volvo-penta-sterndrives","title":"Sierra Piston Ring Set 18-3937 - Replaces GM 14089025, Mercury Marine 39-17464 - 8.9L 575 Marine Engines","description":"\u003cp\u003eThe Sierra 18-3937 Piston Ring Set is a forged aluminum, recessed-head piston ring set built for the 8.9L 575 marine V8 engine family (540 cid, 8-cylinder), covering the 1986-1992 engine range. This is the standard (STD) size set, supplied complete with piston rings and wrist pin so it is ready to install without sourcing additional small parts separately. The forged aluminum construction with a recessed head design is engineered to handle the heat and load cycling of a marine inboard\/sterndrive engine, giving a longer service life than a lower-grade cast replacement in this application.\u003c\/p\u003e\u003cp\u003eBecause marine engines in this family were sold and serviced across multiple brands, the 18-3937 set directly cross-references to GM, Mercury Marine, Mercruiser, OMC, and Volvo Penta piston ring part numbers, so it is a straightforward direct replacement whether the boat's engine data plate shows one of those brand names. Each Sierra piston ring set is manufactured to meet or exceed the original equipment part it replaces. Related part numbers 18-3939 and 18-3938 are also available in the same engine family for other bore sizes; confirm the size stamped on your original pistons before ordering to be sure 18-3937 (STD) is the correct set for your engine.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3937\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999975997\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Forged Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Design:\u003c\/strong\u003e Recessed Head\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e STD (standard)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Family:\u003c\/strong\u003e 8.9L 575\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 540 cid\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinders:\u003c\/strong\u003e 8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYear Range:\u003c\/strong\u003e 1986-1992\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContents:\u003c\/strong\u003e Piston rings and wrist pin, sold individually (one set per rod)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e8.9L 575 marine engine, 540 cid, 8-cylinder, 1986-1992\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM 14089025\u003c\/li\u003e\n\u003cli\u003eMercury Marine 39-17464, 39-34988, 39-65153, 39-67123\u003c\/li\u003e\n\u003cli\u003eMercruiser F328506, F3892364, FI1100386, FI1100692, FI1101321\u003c\/li\u003e\n\u003cli\u003eOMC 328506, 3853268, 3853960, 914555, 985083, 986336\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3853268, 3853960, 3856753, 856171, 856381\u003c\/li\u003e\n\u003cli\u003eCrusader 12370\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3937 piston ring set fit?\u003c\/strong\u003e The Sierra 18-3937 fits the 8.9L 575 marine V8 engine family (540 cid, 8-cylinder) covering the 1986-1992 range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3937 a direct replacement for my OEM piston rings?\u003c\/strong\u003e Yes, 18-3937 cross-references directly to GM 14089025, Mercury Marine 39-17464, Mercruiser part numbers, OMC part numbers, and Volvo Penta part numbers used on the same 8.9L 575 engine family, so it installs as a direct OEM replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the Sierra 18-3937 piston ring set?\u003c\/strong\u003e 18-3937 is the standard (STD) size set; related Sierra part numbers 18-3939 and 18-3938 cover other sizes for the same engine family, so confirm the size stamped on your original pistons before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with the 18-3937 piston ring set?\u003c\/strong\u003e Each 18-3937 set is supplied complete with the piston rings and wrist pin, sold individually as one set per connecting rod.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material are the Sierra 18-3937 piston rings made from?\u003c\/strong\u003e The 18-3937 uses forged aluminum piston construction with a recessed head design, built for the load and heat cycling of a marine inboard\/sterndrive V8.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3937 piston ring set weigh?\u003c\/strong\u003e The 18-3937 piston ring set weighs 0.15 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3937 meet OEM performance standards?\u003c\/strong\u003e Sierra manufactures the 18-3937 to meet or exceed the original equipment piston ring part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich brands used the engine that the 18-3937 fits?\u003c\/strong\u003e The 8.9L 575 engine platform that the 18-3937 fits was serviced under Mercruiser, OMC, and Volvo Penta part numbering, which is why 18-3937 cross-references to part numbers from all three.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between Sierra 18-3937, 18-3939, and 18-3938?\u003c\/strong\u003e 18-3937 is the standard-size piston ring set for the 8.9L 575 engine family; 18-3939 and 18-3938 are separate Sierra part numbers covering other sizes in the same engine application, so the correct one depends on the size of your original pistons.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the 18-3937 piston rings myself?\u003c\/strong\u003e The 18-3937 set comes complete with rings and a wrist pin for a full piston rebuild, though fitting piston rings requires engine teardown and should follow the engine manufacturer's ring gap and installation procedure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3937 genuine or aftermarket?\u003c\/strong\u003e 18-3937 is a Sierra-branded aftermarket piston ring set engineered to meet or exceed OEM specifications for the 8.9L 575 engine family, rather than a part sold under the original engine brand's own packaging.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988170289371,"sku":"SIE-18-3937","price":35.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3937__64438.1722349511.500.750.jpg?v=1785189189"},{"product_id":"sierra-18-3915-piston-ring-set-030-oversize-3-217-in-bore-for-evinrude-johnson-35-70-hp-2-3-cyl-outboards-replaces-omc-391416-434109","title":"Sierra Piston Rings 18-3915,.030 Oversize, 3.217 Bore, Evinrude 50-70 HP 3-Cylinder, Replaces 391416, 434109","description":"\u003cp\u003eThe Sierra 18-3915 piston ring set is built for the 3-cylinder, 50-70 HP outboard engine family with a 3.217 inch cylinder bore and a.030 inch oversize specification. Matching your engine's bore size and oversize is critical when rebuilding a powerhead, since installing the wrong ring size can lead to poor compression, oil consumption, or premature cylinder wear. This set is designed to be installed on the corresponding oversize piston during a top-end or full powerhead rebuild, restoring proper ring-to-cylinder-wall seal so the engine can rebuild compression and run efficiently.\u003c\/p\u003e\u003cp\u003eSierra manufactures replacement marine engine components to OEM specifications, and the 18-3915 is cross-referenced to the original equipment piston ring numbers 391416 and 434109, making it a direct fit for engines originally equipped with those parts. It is intended for use by rebuilders and marine technicians performing cylinder and piston service on qualifying 3-cylinder 50-70 HP outboards.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3915\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Piston Rings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Application:\u003c\/strong\u003e 50-70 HP, 3-Cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Bore Size:\u003c\/strong\u003e 3.217 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOversize:\u003c\/strong\u003e.030 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 391416, 434109\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 0.63 x 3.06 x 3.06 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999542809\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e50-70 HP, 3-Cylinder outboard engines with a 3.217 inch cylinder bore,.030 inch oversize\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e391416\u003c\/li\u003e\n\u003cli\u003e434109\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-3915 piston ring set fit?\u003c\/strong\u003e It fits 3-cylinder, 50-70 HP outboard engines with a 3.217 inch cylinder bore and a.030 inch oversize specification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does 18-3915 replace?\u003c\/strong\u003e The Sierra 18-3915 is a direct cross-reference to OEM piston ring numbers 391416 and 434109.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a standard or oversize ring set?\u003c\/strong\u003e The 18-3915 is a.030 inch oversize ring set, matching a 3.217 inch cylinder bore rather than the standard bore diameter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of the 18-3915 ring set?\u003c\/strong\u003e The Sierra 18-3915 piston rings measure 0.63 x 3.06 x 3.06 inches as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3915 piston ring set weigh?\u003c\/strong\u003e It weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to install oversize piston rings like the 18-3915?\u003c\/strong\u003e Oversize rings such as the 18-3915 are used after a cylinder has been bored out.030 inch over standard, typically during a powerhead rebuild to restore proper compression.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to replace the piston along with the 18-3915 rings?\u003c\/strong\u003e The 18-3915 ring set is sized to match a 3.217 inch bore,.030 oversize piston, so it should be installed on the corresponding oversize piston for that bore specification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3915 a genuine OEM part or aftermarket?\u003c\/strong\u003e The 18-3915 is manufactured by Sierra as a replacement part built to OEM specifications, cross-referenced to original equipment numbers 391416 and 434109.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part number 18-3915?\u003c\/strong\u003e Ordering 18-3915 gets you the complete piston ring set for one 3.217 inch bore,.030 oversize cylinder on a 50-70 HP 3-cylinder outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3915 rings fit a standard-bore cylinder?\u003c\/strong\u003e No. The 18-3915 is specifically sized for a 3.217 inch bore at.030 inch over standard, not a standard-bore cylinder.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988170322139,"sku":"SIE-18-3915","price":34.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3915__06071.1739458781.500.750.jpg?v=1785188064"},{"product_id":"sierra-18-3972-marine-piston-ring-set-standard-for-johnson-evinrude-5-8-hp-outboards-replaces-omc-390082","title":"Sierra Piston Ring 18-3972 for Johnson\/Evinrude 5\/6\/8\/7.5 HP Outboards, 1986-95, 1.937 Inch Standard Bore","description":"\u003cp\u003eThe Sierra 18-3972 is a standard-bore piston ring for Johnson\/Evinrude (OMC) outboard motors, engineered as a direct replacement for the factory ring set on applicable powerheads. It is sized for a 1.937 inch standard bore and is intended for use in 2-cylinder engines rated 5, 6, 8, and 7.5 horsepower for the 1986-95 model years, with the exception of 1991 60-degree V models. The ring is manufactured from alloy steel and cast iron for wear resistance and a reliable seal against the cylinder wall, helping maintain compression and reduce blow-by during a rebuild or piston service.\u003c\/p\u003e\u003cp\u003eThis is a standard-size ring, matched to the original bore diameter rather than an oversize\/overbore replacement, making it the correct choice when the cylinder has not been bored out. It ships as a single unit count and is backed by Sierra's standard limited warranty, giving technicians and DIY boaters a dependable component for internal engine repair work on compatible Johnson\/Evinrude powerheads.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3972\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Piston Ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Piston Rings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Bore:\u003c\/strong\u003e 1.937 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Configuration:\u003c\/strong\u003e 2-cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRing Size:\u003c\/strong\u003e Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel, Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Piston Rings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282235055, 707390455778\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Sierra Limited Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude (OMC) outboard, 5\/6\/8\/7.5 HP, 2-cylinder, 1986-95, except 1991 60-degree V models\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 390082\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3972 piston ring fit?\u003c\/strong\u003e It fits Johnson\/Evinrude (OMC) 2-cylinder outboards rated 5, 6, 8, and 7.5 HP for the 1986-95 model years, except 1991 60-degree V models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat bore size is this ring made for?\u003c\/strong\u003e The 18-3972 is sized for a 1.937 inch standard bore, not an oversize or bored-out cylinder.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3972 a standard ring or an oversize ring?\u003c\/strong\u003e It is a standard ring, matched to the factory bore diameter rather than a.020 or.030 oversize replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-3972 replace?\u003c\/strong\u003e The Sierra 18-3972 replaces OMC part number 390082.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the 18-3972 ring made of?\u003c\/strong\u003e It is made of alloy steel and cast iron, materials chosen for wear resistance and a durable seal against the cylinder wall.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many rings come in the package?\u003c\/strong\u003e The Sierra 18-3972 is sold as a single unit count of piston rings for one piston.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3972 piston ring weigh?\u003c\/strong\u003e It weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this ring work on a 1991 60-degree V model?\u003c\/strong\u003e No, the 18-3972 fitment for 5\/6\/8\/7.5 HP 1986-95 engines specifically excludes 1991 60-degree V models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3972 genuine Sierra or aftermarket?\u003c\/strong\u003e The 18-3972 is a genuine Sierra part, sold as a direct-fit replacement for the OMC piston ring on covered Johnson\/Evinrude powerheads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the cylinder count for engines using the 18-3972?\u003c\/strong\u003e The 18-3972 is designed for 2-cylinder Johnson\/Evinrude outboards in the 5\/6\/8\/7.5 HP range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3972 come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-3972 is covered by Sierra's limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988170354907,"sku":"SIE-18-3972","price":20.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3972__04291.1722491809.500.750.jpg?v=1785188925"},{"product_id":"piston-ring-set-for-mercury-mariner-75-125-hp-3-4-cyl-3-500-std-bore-replaces-39-822321a12-sierra-18-3982","title":"Sierra 18-3982 Piston Ring Set, 3.500 Standard Bore, for Mercury 140-200 HP XR6\/MAG III V-6 Outboards","description":"\u003cp\u003eThe Sierra 18-3982 Piston Ring Set is a set of two piston rings sized for a 3.500 inch standard bore, built for Mercury 140-200 HP XR6\/MAG III V-6 outboard engines. It is manufactured as a direct equivalent to Mercury Marine 39-822321A12, giving boat owners and marine technicians a reliable replacement option when rebuilding or servicing the powerhead on these two-ring inline piston applications. Each ring is finished with a brushed exterior surface for proper seating and wear characteristics during break-in.\u003c\/p\u003e\u003cp\u003ePiston rings seal the combustion chamber, control oil consumption, and transfer heat from the piston to the cylinder wall, so correct bore sizing is critical to a good rebuild. This set is specified for the 3.500 inch standard bore listed for the 140-200 HP XR6\/MAG III V-6 application, matching the piston (18-4635 port \/ 18-4636 starboard) used in that engine family. Sierra manufactures its parts to meet or exceed the specifications of the original equipment part it replaces, making the 18-3982 a straightforward drop-in for engine rebuilds, top-end overhauls, or piston ring replacement jobs on the applicable Mercury outboards.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3982\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard 2 Ring Inline Pistons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e 3.500 inches \/ Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRings per Set:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Brushed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282124809\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury 140-200 HP, XR6\/MAG III V-6 outboards, 3.500 inch standard bore (port and starboard piston applications)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e39-822321A12\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3982 piston ring set fit?\u003c\/strong\u003e It fits Mercury 140-200 HP XR6\/MAG III V-6 outboards with a 3.500 inch standard bore, matching both the port and starboard piston applications for that engine family.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many rings come in the 18-3982 set?\u003c\/strong\u003e The set includes two piston rings, matching the two-ring inline piston design used on the applicable Mercury 140-200 HP XR6\/MAG III V-6 outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-3982 replace?\u003c\/strong\u003e Sierra 18-3982 is a direct equivalent to Mercury Marine part number 39-822321A12.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this ring set for a standard bore or an oversize bore?\u003c\/strong\u003e The 18-3982 set is sized for a 3.500 inch standard bore, not an oversize (.015 or.030) bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3982 piston ring set weigh?\u003c\/strong\u003e It weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the individual piston ring?\u003c\/strong\u003e Each ring in the 18-3982 set measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-3982 genuine Mercury or an aftermarket part?\u003c\/strong\u003e The 18-3982 is a Sierra-branded aftermarket ring set manufactured to meet or exceed the specifications of the Mercury Marine 39-822321A12 part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3982 set work with both the port and starboard pistons?\u003c\/strong\u003e Yes, the same 18-3982 ring part number is used with both the port piston (18-4635) and starboard piston (18-4636) on the 140-200 HP XR6\/MAG III V-6 application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish do the Sierra 18-3982 piston rings have?\u003c\/strong\u003e The rings have a brushed exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3982 piston ring set?\u003c\/strong\u003e The UPC for the Sierra 18-3982 Piston Ring Set is 808282124809.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988170780891,"sku":"SIE-18-3982","price":40.42,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3982__52369.1722490177.500.750.jpg?v=1785188340"},{"product_id":"sierra-18-4088-piston-ring-set-replaces-omc-436353-fits-evinrude-johnson-90-175-hp-v-4-v-6-60-degree-eagle-series-sea-drive-3-600-std-bore","title":"Sierra 18-4088 Piston Ring Set, Replaces 436353, OMC V-4\/V-6 60-Degree Eagle Series 90-175 HP","description":"\u003cp\u003eThe Sierra 18-4088 Piston Ring Set is a standard-size replacement ring set for OMC V-4\/V-6 60-Degree Eagle Series Sea Drive engines, covering the 90-175 HP range built between 1991 and 2000. It is designed for 4 and 6 cylinder blocks with a 3.600 inch standard bore, and the same ring set applies to both port and starboard pistons at this bore size, so one part number covers the full rebuild whether you are working on the port or starboard side of the powerhead.\u003c\/p\u003e\u003cp\u003eEach ring is manufactured from alloy steel and cast iron for wear resistance and a reliable seal against the cylinder wall, helping restore compression and reduce oil blow-by during a top-end rebuild. The set is built to meet or exceed the specification of the original equipment ring it replaces, making it a straightforward drop-in choice when rebuilding OMC 60-Degree Eagle Series powerheads at standard bore.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4088\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Piston Ring Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e 3.600 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiston Size:\u003c\/strong\u003e Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Configuration:\u003c\/strong\u003e 4 and 6 cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Horsepower Range:\u003c\/strong\u003e 90-175 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Model Years:\u003c\/strong\u003e 1991-2000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Series:\u003c\/strong\u003e OMC V-4\/V-6 60-Degree Eagle Series (Sea Drive)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel, Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.07 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 436353\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282125110\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC V-4\/V-6 60-Degree Eagle Series (Sea Drive), 4 and 6 cylinder, 90-175 HP, 1991-2000, 3.600 inch standard bore, port and starboard\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e436353\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-4088 piston ring set fit?\u003c\/strong\u003e It fits OMC V-4\/V-6 60-Degree Eagle Series Sea Drive engines in the 90-175 HP range, 4 and 6 cylinder, built between 1991 and 2000, with a 3.600 inch standard bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-4088 ring set for the port or starboard side?\u003c\/strong\u003e The same Sierra 18-4088 ring set is used on both the port and starboard pistons at the 3.600 inch bore size, so one part number covers either side of the engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat bore size is this ring set made for?\u003c\/strong\u003e 18-4088 is sized for a 3.600 inch standard bore, not an oversize bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM number does the Sierra 18-4088 replace?\u003c\/strong\u003e It replaces OEM number 436353 on OMC 60-Degree Eagle Series 3.600 inch bore engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a standard size or oversize ring set?\u003c\/strong\u003e The 18-4088 set is the standard size ring for the 3.600 inch bore; oversize bores use different Sierra part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many cylinders does this ring set cover per engine?\u003c\/strong\u003e It is used on 4 and 6 cylinder OMC V-4\/V-6 60-Degree Eagle Series Sea Drive engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat model years does the 18-4088 cover?\u003c\/strong\u003e It covers the 1991-2000 model years on OMC 60-Degree Eagle Series 90-175 HP engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the piston rings made of?\u003c\/strong\u003e The Sierra 18-4088 rings are made of alloy steel and cast iron for wear resistance in the cylinder bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with the Sierra 18-4088?\u003c\/strong\u003e The listing is for one piston ring set, part number 18-4088, sized for a single 3.600 inch bore cylinder.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4088 ring set weigh?\u003c\/strong\u003e It weighs 0.07 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is 18-4088 different from 18-4089 or 18-4090?\u003c\/strong\u003e 18-4088 is sized for a 3.600 inch bore, 18-4089 is sized for a 3.620 inch bore, and 18-4090 is sized for a 3.630 inch bore and replaces a different OEM ring number, 436354.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-4088 meet OEM specification?\u003c\/strong\u003e Yes, the 18-4088 ring set is built to meet or exceed the specification of the 436353 OEM ring it replaces.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988170813659,"sku":"SIE-18-4088","price":40.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-4088__24849.1737859077.500.750.jpg?v=1785188216"},{"product_id":"sierra-18-4226-marine-drain-plug-for-mercruiser-replaces-22-806608a1-22-806608a02","title":"Sierra 18-4226 Drain Plug, Replaces Mercruiser 22-806608A1 and 22-806608A02","description":"\u003cp\u003eThe Sierra 18-4226 Drain Plug is a direct replacement drain plug engineered for Mercruiser exhaust manifold drain applications. It is molded from durable black plastic designed to seal the manifold drain port securely, helping prevent freeze damage and corrosion-related leaks when the engine is winterized or drained for service. As a genuine Sierra part, it is built to meet or exceed the quality of the original equipment plug it replaces.\u003c\/p\u003e\u003cp\u003eThis drain plug is a straightforward, one-piece replacement part sold individually, making it an easy and affordable fix when an original Mercruiser drain plug is lost, cracked, or no longer seals properly. Because it is cross-referenced to the Mercruiser 22-806608A1 and 22-806608A02 numbers, boat owners and technicians can confirm fitment by matching the old part number before ordering. Sierra part 18-4226 is a reliable choice for routine engine maintenance, winterization, and exhaust manifold servicing.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4226\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Drain Plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.27 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282125158\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 22-806608A1, 22-806608A02\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercruiser Exhaust Manifold\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Mercruiser exhaust manifold applications using drain plug numbers 22-806608A1 or 22-806608A02.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e22-806608A1\u003c\/li\u003e\n\u003cli\u003e22-806608A02\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-4226 drain plug replace?\u003c\/strong\u003e The Sierra 18-4226 drain plug replaces Mercruiser part numbers 22-806608A1 and 22-806608A02.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-4226 drain plug made of?\u003c\/strong\u003e It is made of black plastic, molded to seal the drain port of a Mercruiser exhaust manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4226 drain plug weigh?\u003c\/strong\u003e It weighs 1.27 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e Sierra 18-4226 is a Sierra-brand replacement part built to meet or exceed the quality of the original Mercruiser drain plug it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is this drain plug used for?\u003c\/strong\u003e It is used to seal the drain port on Mercruiser exhaust manifolds, commonly removed during winterization or engine maintenance to drain water from the manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many drain plugs come in a package?\u003c\/strong\u003e The Sierra 18-4226 is sold as a single drain plug, one count per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-4226 drain plug?\u003c\/strong\u003e It is black.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if 18-4226 is the correct drain plug for my engine?\u003c\/strong\u003e Check the part number stamped on your existing drain plug; if it reads 22-806608A1 or 22-806608A02, the Sierra 18-4226 is the correct replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-4226 include any other hardware in the box?\u003c\/strong\u003e No, it includes only the drain plug itself; no additional hardware is included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra part number for this drain plug?\u003c\/strong\u003e The part number is 18-4226.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988172058843,"sku":"SIE-18-4226","price":3.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/88911_18-4226front__50468.1753840680.500.750.jpg?v=1785188449"},{"product_id":"drain-screw-o-ring-for-johnson-evinrude-omc-stern-drive-replaces-omc-336982-pack-of-5","title":"Sierra 18-4253-9 Drain Screw O-Ring, Replaces 311598, Johnson\/Evinrude Outboard, Pack of 5","description":"\u003cp\u003eThe Sierra 18-4253-9 Drain Screw O-Ring is a rubber sealing ring designed to be used with the Sierra 18-2387 Drain Screw on Johnson\/Evinrude outboard engines and OMC stern drives. This O-ring creates the seal that keeps gear case lubricant contained around the drain screw threads, preventing leaks and water intrusion at one of the most commonly serviced points on an outboard lower unit. Because drain screw O-rings compress and take a permanent set each time the drain screw is removed for a gear lube change, they should be replaced every time the drain screw is pulled rather than reused, and keeping a supply on hand avoids a return trip to the parts counter mid-service.\u003c\/p\u003e\u003cp\u003eEach package contains five O-rings, made from black rubber for reliable resistance to gear lube and marine environments. Sierra parts are built to meet or exceed the specification of the original equipment part they replace, so this O-ring restores the factory seal without modification to the drain screw or gear case housing.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4253-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 311598\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 5 O-rings per pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed With:\u003c\/strong\u003e 18-2387 Drain Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.05 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282187118\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for use in Johnson\/Evinrude outboard engines and OMC stern drives, used with the Sierra 18-2387 Drain Screw.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e311598\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-4253-9 used for?\u003c\/strong\u003e It is a rubber O-ring that seals the Sierra 18-2387 Drain Screw on Johnson\/Evinrude outboard engines and OMC stern drives, preventing gear lube leaks and water intrusion at the drain screw.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-4253-9 replace?\u003c\/strong\u003e Sierra 18-4253-9 replaces OEM part number 311598.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many O-rings come in a pack?\u003c\/strong\u003e Each package of the Sierra 18-4253-9 includes five drain screw O-rings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the drain screw O-ring made of?\u003c\/strong\u003e Black rubber, chosen for its resistance to gear lube and marine environments.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich drain screw does this O-ring fit?\u003c\/strong\u003e The 18-4253-9 O-ring is used with the Sierra 18-2387 Drain Screw.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould the drain screw O-ring be replaced every time the drain screw is removed?\u003c\/strong\u003e Yes, once compressed and removed the O-ring takes a permanent set, so it is best practice to install a fresh 18-4253-9 O-ring each time the drain screw is pulled for a gear lube change.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this O-ring fit stern drives as well as outboards?\u003c\/strong\u003e Yes, the 18-4253-9 O-ring is designed for use in Johnson\/Evinrude outboard engines and OMC stern drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does a pack of these O-rings weigh?\u003c\/strong\u003e A package of five Sierra 18-4253-9 O-rings weighs 0.05 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4253-9 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra aftermarket part built to meet or exceed the specification of the original 311598 equipment it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the package?\u003c\/strong\u003e One package of the 18-4253-9 contains five black rubber drain screw O-rings, with no drain screw or other hardware included.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988172255451,"sku":"SIE-18-4253-9","price":2.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4253-9_lg__63121.1558126089.500.750.jpg?v=1785188269"},{"product_id":"sierra-18-4380-marine-timing-chain-gasket-set-replaces-mercruiser-27-68714-fits-224-cid-engines-165-488-hp","title":"Sierra 18-4380 Timing Chain Gasket Set, Replaces 27-68714A6, for Mercruiser 224 CID Engines","description":"\u003cp\u003eThe Sierra 18-4380 Timing Chain Gasket Set is a complete gasket kit engineered for Mercruiser 224 CID engines, covering the 165, 170, 180, 190, 470, 485 and 488 HP versions of that engine. It is built for boat owners and marine technicians servicing the timing chain cover and related sealing points during an engine rebuild or gasket replacement job, giving you every gasket needed in one kit rather than sourcing each piece separately.\u003c\/p\u003e\u003cp\u003eBeyond the timing chain cover gasket itself, this set includes the sub-component gaskets required to complete the job correctly: a fuel pump mounting gasket and two water pump gaskets, each cross-referenced to their original equipment part numbers so fit and sealing performance match the components they replace. Sierra manufactures this set to meet or exceed the original equipment part it replaces, and every Sierra part is backed by Sierra's standard customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003eThis kit is sold as Sierra part number 18-4380 and is a direct fit for the Mercruiser 224 CID engine platform listed below. Confirm your engine's CID and horsepower rating against the fitment list before ordering to ensure correct application.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4380\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Timing Chain Gasket Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e Mercruiser 224 CID Engine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower Ratings:\u003c\/strong\u003e 165, 170, 180, 190, 470, 485, 488 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Fuel Pump Mounting Gasket (Sierra 18-0889, O.E. 27-34213) - Qty 1; Water Pump Gasket (Sierra 18-0903, O.E. 27-49110) - Qty 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-68714A6, 27-68714A7, 27-68714, 27-72098\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.41 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282259228\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser 224 CID Engine - 165, 170, 180, 190, 470, 485 \u0026amp; 488 HP\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-68714A6\u003c\/li\u003e\n\u003cli\u003e27-68714A7\u003c\/li\u003e\n\u003cli\u003e27-68714\u003c\/li\u003e\n\u003cli\u003e27-72098\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engine does the Sierra 18-4380 Timing Chain Gasket Set fit?\u003c\/strong\u003e The Sierra 18-4380 Timing Chain Gasket Set fits the Mercruiser 224 CID engine in the 165, 170, 180, 190, 470, 485 and 488 HP variants.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does 18-4380 replace?\u003c\/strong\u003e Sierra 18-4380 replaces OEM numbers 27-68714A6, 27-68714A7, 27-68714 and 27-72098.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in this gasket set?\u003c\/strong\u003e The kit contains the timing chain gasket components plus a fuel pump mounting gasket (Sierra 18-0889, O.E. 27-34213, qty 1) and two water pump gaskets (Sierra 18-0903, O.E. 27-49110, qty 2).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-4380 gasket set weigh?\u003c\/strong\u003e This set weighs 0.41 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the gasket material?\u003c\/strong\u003e The gaskets in the Sierra 18-4380 set are white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e Sierra 18-4380 is a genuine Sierra-manufactured part, engineered to meet or exceed the original equipment part it replaces and covered by Sierra's customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill 18-4380 work on any Mercruiser engine?\u003c\/strong\u003e No, this set is specific to the Mercruiser 224 CID engine across the 165, 170, 180, 190, 470, 485 and 488 HP ratings; it is not a universal gasket set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this set include the fuel pump gasket separately, or do I need to buy it separately?\u003c\/strong\u003e The fuel pump mounting gasket (Sierra 18-0889, O.E. 27-34213) is included in the Sierra 18-4380 kit, so no separate purchase is needed for that component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many water pump gaskets come in the box?\u003c\/strong\u003e Two water pump gaskets (Sierra 18-0903, O.E. 27-49110) are included in the Sierra 18-4380 Timing Chain Gasket Set.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-4380 Timing Chain Gasket Set?\u003c\/strong\u003e The UPC for Sierra 18-4380 is 808282259228.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988195094747,"sku":"SIE-18-4380","price":27.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4380_lg__65156.1558126779.500.750.jpg?v=1785188549"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/collections\/ECO-96009__17545.1747363868.500.750_1058af55-5167-486b-bc79-8d37ef91ef28.jpg?v=1785356950","url":"https:\/\/www.goodvibesmarina.com\/collections\/gvcat-engine-parts-systems-gaskets-seals-bearings-o-rings-gasket-sets.oembed","provider":"Good Vibes Marina","version":"1.0","type":"link"}