{"product_id":"exhaust-4-protector-flapper-for-mercruiser-mercury-sterndrive-12644a1-18-4457","title":"Exhaust 4” Protector Flapper for MerCruiser Mercury Sterndrive 12644A1, 18-4457","description":"\u003ch2\u003eExhaust 4” Protector Flapper for MerCruiser and Mercury\u003c\/h2\u003e\u003cp\u003eThis exhaust protector flapper replaces OEM part numbers 12644A1 and 18-4457 for MerCruiser and Mercury sterndrive systems.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis 4-inch exhaust protector flapper is a direct replacement for MerCruiser and Mercury sterndrive exhaust systems. It prevents backflow and debris entry while maintaining proper exhaust flow. Designed to fit 4-inch exhaust outlets, it is a common maintenance item for boat owners.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eStainless steel hinge pin resists corrosion\u003c\/li\u003e\n\u003cli\u003eFlexible rubber flap seals tightly against outlet\u003c\/li\u003e\n\u003cli\u003ePre-assembled for quick installation\u003c\/li\u003e\n\u003cli\u003eCompatible with MerCruiser and Mercury aftermarket exhaust systems\u003c\/li\u003e\n\u003cli\u003eLightweight design reduces stress on mounting points\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrevents water and debris from entering exhaust when not in use\u003c\/li\u003e\n\u003cli\u003eUsed on sterndrive boats with through-hull exhaust outlets\u003c\/li\u003e\n\u003cli\u003eReplaces worn or missing flapper protectors during routine maintenance\u003c\/li\u003e\n\u003cli\u003eWorks in both fresh and saltwater conditions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12644A1, 18-4457\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRubber flap with stainless steel hinge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this flapper fit all MerCruiser sterndrives? \u003cstrong\u003eA:\u003c\/strong\u003e It fits many MerCruiser and Mercury sterndrive models with a 4-inch exhaust outlet. Check your existing part number against 12644A1 or 18-4457.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can I install this myself? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, installation typically requires removing two screws and replacing the old flapper. Ensure the exhaust outlet is clean before mounting.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":44957591470166,"sku":"ZZ2Y00919","price":39.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/57_ac3e773e-2159-4fc2-8e0a-9e2933753c40.jpg?v=1781569184","url":"https:\/\/www.solidspare.com\/products\/exhaust-4-protector-flapper-for-mercruiser-mercury-sterndrive-12644a1-18-4457","provider":"Solid Spare","version":"1.0","type":"link"}