{"product_id":"sierra-18-2378-magnetic-drain-fill-screw-lower-gearcase-plug-for-evinrude-outboards-replaces-omc-311598","title":"Sierra Magnetic Drain Screw 18-2378, Replaces 309243, for Cobra Drives \u0026 V-6 40-50HP (1989-97)","description":"\u003cp\u003eThe Sierra 18-2378 is a magnetic drain screw designed for gearcase drain and fill service on Cobra Drives \u0026amp; V-6 applications, 40-50HP (1989-97). The built-in magnetic tip attracts fine metal particles circulating in the gear lubricant, helping catch early signs of internal wear before they cause bigger gearcase problems. It is a direct replacement for OEM number 309243, so it installs in the original drain location without modification.\u003c\/p\u003e\u003cp\u003eThis drain screw is supplied in a package of 50, without washer, making it a practical choice for shops and technicians who service multiple units or want spares on hand for routine gearcase maintenance and lubricant changes. Keeping the drain screw magnetic and in good condition is a simple, low-cost way to monitor gearcase health during scheduled service intervals.\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 18-2378\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Magnetic Drain Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 309243\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Cobra Drives \u0026amp; V-6, 40-50HP (1989-97)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 50 (without washer)\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 808282257811\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eCobra Drives \u0026amp; V-6, 40-50HP (1989-97)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e309243\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-2378 used for?\u003c\/strong\u003e The Sierra 18-2378 is a magnetic drain screw used in the gearcase drain and fill port to service gear lubricant on Cobra Drives \u0026amp; V-6 applications, 40-50HP (1989-97).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2378 replace OEM part 309243?\u003c\/strong\u003e Yes, Sierra part 18-2378 is a direct replacement for OEM number 309243.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does 'magnetic' mean on this drain screw?\u003c\/strong\u003e The tip of the 18-2378 drain screw is magnetized so it attracts fine metal particles suspended in the gear lubricant, giving a visual early indicator of internal wear when the screw is removed during service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines and horsepower range does 18-2378 fit?\u003c\/strong\u003e This drain screw fits Cobra Drives \u0026amp; V-6 applications rated 40-50HP (1989-97).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2378 come with a washer?\u003c\/strong\u003e No, the 18-2378 package is supplied without a washer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many drain screws come in a package of the 18-2378?\u003c\/strong\u003e The 18-2378 is packaged in a quantity of 50 per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2378 magnetic drain screw weigh?\u003c\/strong\u003e The Sierra 18-2378 weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2378 a genuine Sierra part?\u003c\/strong\u003e Yes, 18-2378 is Sierra's own part number for this magnetic drain screw.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2378 be used for both drain and fill service?\u003c\/strong\u003e Yes, the 18-2378 magnetic drain screw is used at the gearcase drain location during lubricant drain and fill service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2378?\u003c\/strong\u003e The UPC for the Sierra 18-2378 magnetic drain screw is 808282257811.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988106129627,"sku":"SIE-18-2378","price":13.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2378__24863.1722363214.500.750.jpg?v=1785329169","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2378-magnetic-drain-fill-screw-lower-gearcase-plug-for-evinrude-outboards-replaces-omc-311598","provider":"Good Vibes Marina","version":"1.0","type":"link"}