{"product_id":"sierra-18-4457-exhaust-protector-valve-4-inch-101-6-mm-replaces-mercury-12644a1-rubber-flapper-check-valve-with-stainless-steel-clamp","title":"Sierra 18-4457 Exhaust Protector Valve, Replaces Mercury Marine 12644A1, 4 Inch EPDM","description":"\u003cp\u003eThe Sierra 18-4457 Exhaust Protector Valve is a rubber flapper-style check valve built to keep water out of an inboard engine's exhaust system. It uses compounded rubber flapper valves that open to let exhaust flow out and close to block water from siphoning back in through the exhaust path when the engine is off or running at low speed. The valve body is made from weather resistant EPDM with a U\/V stabilizer, which helps it hold up against sun exposure, heat cycling, and the marine environment better than untreated rubber. It is sized at 4 inches and ships with a stainless steel clamp, so the hardware needed to secure it in the exhaust line is included in the box.\u003c\/p\u003e\u003cp\u003eThis valve is built to the same fit, form, and function as the original equipment part it replaces and is designed to be interchangeable with GLM 89250, Mallory 9-44001, Mercruiser 13644Q01, and Mercury Marine 12644A1. It is commonly used on inboard exhaust manifold systems, including Chrysler inboard applications. Boat owners typically replace this type of valve when the rubber flapper becomes stiff, cracked, or no longer seals properly, which can allow water intrusion into the exhaust manifold or 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 18-4457\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Protector Valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 4 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e EPDM with U\/V stabilizer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Hardware:\u003c\/strong\u003e Stainless steel clamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.57 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 8 x 6 x 1.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999621863\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Chrysler Inboard Exhaust Manifolds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for inboard exhaust manifold systems, including Chrysler inboard applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 89250\u003c\/li\u003e\n\u003cli\u003eMallory 9-44001\u003c\/li\u003e\n\u003cli\u003eMercruiser 13644Q01\u003c\/li\u003e\n\u003cli\u003eMercury Marine 12644A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-4457 Exhaust Protector Valve do?\u003c\/strong\u003e It is a flapper-style check valve that lets exhaust gas flow out of the engine while blocking water from siphoning back into the exhaust system, protecting the manifold and engine from water intrusion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the 18-4457 valve?\u003c\/strong\u003e The Sierra 18-4457 is a 4 inch exhaust protector valve.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the valve made from?\u003c\/strong\u003e It is made from weather resistant EPDM rubber with a U\/V stabilizer, which helps the flapper valves hold up to sun and heat exposure in a marine exhaust environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-4457 come with mounting hardware?\u003c\/strong\u003e Yes, a stainless steel clamp is included with the Sierra 18-4457 to secure it in the exhaust line.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4457 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-4457 is a Sierra aftermarket part built to match the fit, form, and function of the original equipment valve it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM or other brand part numbers does the 18-4457 replace?\u003c\/strong\u003e The Sierra 18-4457 is designed to be interchangeable with GLM 89250, Mallory 9-44001, Mercruiser 13644Q01, and Mercury Marine 12644A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Mercury Marine 12644A1 the same as the Sierra 18-4457?\u003c\/strong\u003e Yes, the Sierra 18-4457 Exhaust Protector Valve is designed as a direct interchange for Mercury Marine 12644A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4457 exhaust valve weigh?\u003c\/strong\u003e The Sierra 18-4457 weighs 0.57 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-4457 valve?\u003c\/strong\u003e The Sierra 18-4457 measures 8 x 6 x 1.5 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of exhaust system is the 18-4457 used on?\u003c\/strong\u003e This valve is used on inboard exhaust manifold systems, including Chrysler inboard applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my exhaust protector valve needs to be replaced?\u003c\/strong\u003e If the rubber flapper on your existing valve is cracked, stiff, or no longer sealing, water can enter the exhaust manifold; the Sierra 18-4457 is built to replace a worn valve with the same fit and function.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4457 discontinued?\u003c\/strong\u003e No, the Sierra 18-4457 Exhaust Protector Valve is an active, currently available part.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988197454043,"sku":"SIE-18-4457","price":32.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4457_lg__56665.1558126579.500.750.jpg?v=1785188798","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-4457-exhaust-protector-valve-4-inch-101-6-mm-replaces-mercury-12644a1-rubber-flapper-check-valve-with-stainless-steel-clamp","provider":"Good Vibes Marina","version":"1.0","type":"link"}