{"product_id":"sierra-18-4456-exhaust-protector-valve-3-in-npt-replaces-mercury-mercruiser-34765a1-glm-89240","title":"Sierra 18-4456 Exhaust Protector Valve - Replaces GLM 89240, Mallory 9-44000, Mercruiser 34765A2\/34765A1","description":"\u003cp\u003eThe Sierra 18-4456 Exhaust Protector Valve is a lift check valve designed to protect an inboard or sterndrive engine's exhaust system from water intrusion. Machined from metal for durability in the marine engine bay, the valve uses 3 inch NPT (National Pipe Tapered) threaded connections and features two ports for inline installation in the exhaust path. Its compact 0.39 x 0.39 x 0.39 inch body allows it to fit into the same mounting space as the original equipment valve it replaces.\u003c\/p\u003e\u003cp\u003eSierra manufactures this valve to meet or exceed original equipment quality, making it a direct functional replacement for the OEM valves listed below. The Sierra 18-4456 is built for reliable, long-term service protecting the engine from backflow of water through the exhaust system.\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 18-4456\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Exhaust Protector Valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e Lift Check Valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Connection Size:\u003c\/strong\u003e 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Connection Type:\u003c\/strong\u003e National Pipe Tapered\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Ports:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.43 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999621856\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 89240\u003c\/li\u003e\n\u003cli\u003eMallory 9-44000\u003c\/li\u003e\n\u003cli\u003eMercruiser 34765A2\u003c\/li\u003e\n\u003cli\u003eMercruiser 34765A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-4456 Exhaust Protector Valve used for?\u003c\/strong\u003e It is a lift check valve installed in an inboard or sterndrive exhaust system to prevent water from flowing back into the engine, protecting it from water intrusion damage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-4456 replace?\u003c\/strong\u003e The Sierra 18-4456 is interchangeable with GLM 89240, Mallory 9-44000, and Mercruiser 34765A2 and 34765A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4456 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra aftermarket replacement valve engineered to meet or exceed the quality of the original equipment part it replaces, including the Mercruiser 34765A2 and 34765A1 valves.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-4456 valve?\u003c\/strong\u003e The valve measures 0.39 x 0.39 x 0.39 inches, a compact size that fits the same mounting space as the original equipment exhaust protector valve.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-4456 Exhaust Protector Valve made from?\u003c\/strong\u003e The 18-4456 is made from machined metal, giving it durability for use in a marine engine's exhaust system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat thread size and type does the Sierra 18-4456 use?\u003c\/strong\u003e It uses a 3 inch NPT (National Pipe Tapered) threaded connection at the inlet.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many ports does the Sierra 18-4456 valve have?\u003c\/strong\u003e The Sierra 18-4456 Exhaust Protector Valve has two ports.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of valve is the Sierra 18-4456?\u003c\/strong\u003e It is a lift check valve, which allows exhaust flow in one direction while blocking water backflow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-4456 weigh?\u003c\/strong\u003e The Sierra 18-4456 Exhaust Protector Valve weighs 0.43 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-4456 fit the same applications as the Mercruiser 34765A2 valve?\u003c\/strong\u003e Yes, the Sierra 18-4456 is a direct interchange for the Mercruiser 34765A2 and 34765A1 exhaust protector valves, as well as the GLM 89240 and Mallory 9-44000 equivalents.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the Sierra 18-4456 have?\u003c\/strong\u003e The valve has a machined metal finish.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988197617883,"sku":"SIE-18-4456","price":33.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4456_lg__71287.1558126523.500.750.jpg?v=1785188342","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-4456-exhaust-protector-valve-3-in-npt-replaces-mercury-mercruiser-34765a1-glm-89240","provider":"Good Vibes Marina","version":"1.0","type":"link"}