{"product_id":"water-pump-gasket-for-mercury-outboards-replaces-oem-27-42631-1-sierra-18-2919","title":"Sierra Water Pump Gasket 18-2919 - Replaces 27-426311, 27-42631","description":"\u003cp\u003eThe Sierra 18-2919 Water Pump Gasket is a replacement gasket engineered to seal the water pump housing on applicable outboard engines, restoring proper compression and preventing leaks at the pump base. It is designed as a direct fit for water pump assemblies that call for OEM 27-426311 or 27-42631 gaskets, giving installers a reliable seal without the delays of sourcing original equipment. Because a worn or torn water pump gasket is a common cause of reduced cooling pressure and pump leakage, replacing this gasket during any water pump service or impeller change helps ensure the housing seats correctly and the cooling system holds pressure as intended. This is a lightweight, single-use sealing component intended to be installed fresh any time the water pump housing is removed or serviced, rather than reused. Keeping a gasket like this on hand alongside an impeller kit is standard practice for a complete water pump rebuild, since reusing an old gasket after the housing has been disturbed increases the risk of a leak path forming at the mating surface. The Sierra 18-2919 is manufactured to the dimensions and material spec needed to match the original gasket it replaces, so it installs in the same location using the same fasteners as the factory part.\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 18-2919\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Water Pump Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999314239\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits water pump housings that use the 27-426311 or 27-42631 gasket.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-426311\u003c\/li\u003e\n\u003cli\u003e27-42631\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2919 gasket fit?\u003c\/strong\u003e The Sierra 18-2919 is a water pump gasket designed to fit water pump housings that call for OEM gasket 27-426311 or 27-42631.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-2919 the same as OEM part 27-426311?\u003c\/strong\u003e Yes, the Sierra 18-2919 water pump gasket is a direct replacement for OEM 27-426311, and it also replaces OEM 27-42631.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the 18-2919 gasket made for?\u003c\/strong\u003e It is a water pump housing gasket, used to seal the mating surface of an outboard water pump during installation or service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2919 water pump gasket weigh?\u003c\/strong\u003e The Sierra 18-2919 weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I replace the water pump gasket every time I service the pump?\u003c\/strong\u003e Yes, a water pump gasket such as the Sierra 18-2919 is a single-use sealing part and should be replaced any time the water pump housing is removed, rather than reinstalling the old gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2919 gasket come with the impeller?\u003c\/strong\u003e No, the Sierra 18-2919 is sold as a standalone gasket and does not include an impeller or other water pump kit components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2919 gasket genuine Sierra or aftermarket?\u003c\/strong\u003e The 18-2919 is a Sierra-branded gasket manufactured as a replacement part carrying the Sierra part number 18-2919.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM numbers cross-reference to the Sierra 18-2919?\u003c\/strong\u003e The Sierra 18-2919 water pump gasket cross-references to OEM numbers 27-426311 and 27-42631.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reuse my old water pump gasket instead of buying the 18-2919?\u003c\/strong\u003e Reusing an old water pump gasket after the housing has been disturbed increases the risk of a leak, so replacing it with a fresh gasket like the Sierra 18-2919 during service is recommended.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2919 gasket?\u003c\/strong\u003e The UPC for the Sierra 18-2919 water pump gasket is 030999314239.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988133359835,"sku":"SIE-18-2919","price":0.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2919_lg__47379.1558125510.500.750.jpg?v=1785188727","url":"https:\/\/www.goodvibesmarina.com\/products\/water-pump-gasket-for-mercury-outboards-replaces-oem-27-42631-1-sierra-18-2919","provider":"Good Vibes Marina","version":"1.0","type":"link"}