{"product_id":"sierra-18-4458-exhaust-protector-valve-for-5in-6in-wet-exhaust-pipe-replaces-glm-89260-mallory-9-44002","title":"Sierra 18-4458 Exhaust Protector Valve, White, 5 Inch and 6 Inch, Replaces GLM 89260","description":"\u003cp\u003eThe Sierra 18-4458 Exhaust Protector Valve is a white exhaust flapper valve built to keep water out of your boat's exhaust system. It uses compounded rubber flapper valves that block water from traveling back up the exhaust hose when the engine is off or idling, protecting the exhaust manifold and engine from water intrusion. The valve is molded from weather resistant EPDM with a UV stabilizer, so it holds up to sun exposure, saltwater, and engine heat without breaking down over time.\u003c\/p\u003e\u003cp\u003eThis valve is sized to fit 5 inch and 6 inch exhaust hose (127 mm and 152.4 mm). The 5 inch size requires two 45 degree cuts to install properly. A stainless steel clamp is included to secure the valve in place. The 18-4458 is the standard, non-display packaged version of this valve; a display packaged version is offered under a separate part number for retail packaging needs. It is a direct interchange for GLM 89260 and Mallory 9-44002 exhaust protector valves, so it can be used as a replacement wherever those valves are specified.\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 18-4458\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Protector Valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 5 inches and 6 inches (127 mm and 152.4 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Note:\u003c\/strong\u003e 5 inch size requires two 45 degree cuts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Weather resistant EPDM with UV stabilizer; compounded rubber flapper valves\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 0.91 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Non-Display (Display Packaged version available as a separate part number)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned as a direct replacement for exhaust systems using a GLM 89260 or Mallory 9-44002 exhaust protector valve, fitting 5 inch or 6 inch exhaust hose.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 89260\u003c\/li\u003e\n\u003cli\u003eMallory 9-44002\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat sizes does the Sierra 18-4458 exhaust protector valve fit?\u003c\/strong\u003e The 18-4458 fits 5 inch and 6 inch exhaust hose, equal to 127 mm and 152.4 mm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 5 inch size need any special preparation to install?\u003c\/strong\u003e Yes, when using the 5 inch size of the Sierra 18-4458, two 45 degree cuts are required for a proper fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-4458 exhaust protector valve made of?\u003c\/strong\u003e It is made of weather resistant EPDM with a UV stabilizer, with compounded rubber flapper valves that form the water-blocking seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4458 interchangeable with other brands?\u003c\/strong\u003e Yes, the 18-4458 is a direct interchange for GLM 89260 and Mallory 9-44002 exhaust protector valves.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does an exhaust protector valve do?\u003c\/strong\u003e The compounded rubber flapper valves in the Sierra 18-4458 prevent water from entering the exhaust system through the exhaust hose.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-4458 valve?\u003c\/strong\u003e The 18-4458 exhaust protector valve is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-4458 come with a clamp?\u003c\/strong\u003e Yes, a stainless steel clamp is included with the 18-4458 exhaust protector valve.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-4458 exhaust protector valve weigh?\u003c\/strong\u003e It weighs 0.91 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4458 weatherproof?\u003c\/strong\u003e Yes, it is molded from weather resistant EPDM with a UV stabilizer, making it suitable for continued sun and saltwater exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-4458 and the 18-4458D?\u003c\/strong\u003e The 18-4458 is the standard, non-display packaged version of this exhaust protector valve, while the 18-4458D is the same valve in display packaging.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988197486811,"sku":"SIE-18-4458","price":60.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-4458__19258.1722498223.500.750.jpg?v=1785188197","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-4458-exhaust-protector-valve-for-5in-6in-wet-exhaust-pipe-replaces-glm-89260-mallory-9-44002","provider":"Good Vibes Marina","version":"1.0","type":"link"}