{"product_id":"sierra-18-1728-bellows-flange-ring-replaces-oem-816607-fits-mercruiser-alpha-one-gen-ii-1991-and-up","title":"Sierra 18-1728 Bellow Flange Ring for MerCruiser Alpha One Gen II (1991 \u0026 Up)","description":"\u003cp\u003eThe Sierra 18-1728 is a rubber bellow flange ring built for MerCruiser Alpha One (Gen II) sterndrives (1991 and up). This white rubber ring seals and reinforces the flange area of the exhaust\/drive bellow assembly, helping maintain a watertight connection between the transom and the sterndrive unit. As a wear component in the sterndrive's bellows system, it is a part boat owners typically replace during routine bellows maintenance or when performing a full bellows kit replacement, since rubber components in this location are exposed to constant flexing, saltwater or freshwater immersion, and engine vibration over time.\u003c\/p\u003e\u003cp\u003eSierra manufactures this flange ring to meet or exceed the specifications of the original equipment part it is designed to work with, and Sierra supplies parts to OEM engine manufacturers and boat builders as part of its regular production. The compact, lightweight ring is easy to handle during installation and is sized specifically for Alpha One (Gen II) applications, so boat owners working on this sterndrive series can source a correctly fitted replacement flange ring rather than a generic 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 18-1728\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 White\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 808282295073\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit Type:\u003c\/strong\u003e Universal Fit within stated application\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMerCruiser Alpha One (Gen II), 1991 \u0026amp; Up\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat boats and drives does the Sierra 18-1728 fit?\u003c\/strong\u003e The Sierra 18-1728 bellow flange ring is designed for MerCruiser Alpha One (Gen II) sterndrives, 1991 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-1728 flange ring made of?\u003c\/strong\u003e It is made of white rubber, a material chosen for its flexibility and ability to hold a seal in the bellows flange area.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1728 weigh?\u003c\/strong\u003e This flange ring weighs 0.01 pounds, reflecting its small, lightweight construction.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1728 an OEM or aftermarket part?\u003c\/strong\u003e The 18-1728 is a Sierra-manufactured part engineered to meet or exceed the specifications of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-1728 bellow flange ring?\u003c\/strong\u003e The UPC for this part is 808282295073.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this flange ring?\u003c\/strong\u003e Replacement is typically needed during sterndrive bellows maintenance, since rubber components at the flange are subject to ongoing flexing and water exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1728 fit older MerCruiser Alpha One models before Gen II?\u003c\/strong\u003e No fitment is stated for MerCruiser Alpha One models prior to the Gen II, 1991-and-up application; only that range is confirmed for the 18-1728.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-1728 bellow flange ring?\u003c\/strong\u003e The ring is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a universal-fit part?\u003c\/strong\u003e The Sierra 18-1728 is listed as a universal fit within its stated MerCruiser Alpha One (Gen II), 1991 \u0026amp; Up application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra stand behind the 18-1728 with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-1728 bellow flange ring is covered by a limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988088828123,"sku":"SIE-18-1728","price":21.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1728__25318.1729019993.500.750.jpg?v=1785188543","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-1728-bellows-flange-ring-replaces-oem-816607-fits-mercruiser-alpha-one-gen-ii-1991-and-up","provider":"Good Vibes Marina","version":"1.0","type":"link"}