{"product_id":"thermostat-cover-gasket-2-pack-replaces-rm0003-marine-engine","title":"Sierra Thermostat Gasket 18-0878-9, Replaces RM0003, Pack of 2","description":"\u003cp\u003eThis Sierra thermostat gasket seals the thermostat housing on the engine, creating the seal needed to prevent coolant leaks at the mating surface between the thermostat cover and the engine block or housing. It is sold as part number 18-0878-9 and is packaged two gaskets per package, so you have a spare on hand or enough for a job that requires servicing more than one housing. Thermostat gaskets are a wear item that should be replaced any time the thermostat cover is removed, since reusing an old gasket can result in a coolant leak or an improper seal even if the gasket appears undamaged. This part is a direct equivalent for OEM number RM0003, making it a straightforward replacement when that OEM number is called for. Keeping a correct-fit thermostat gasket on hand is a low-cost way to avoid downtime during routine cooling system maintenance, thermostat replacement, or housing inspection.\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 18-0878-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thermostat Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets per package\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 808282161828\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eRM0003\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in this package?\u003c\/strong\u003e Sierra part number 18-0878-9 is sold two gaskets per package, priced per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM number does this thermostat gasket replace?\u003c\/strong\u003e This gasket replaces OEM number RM0003.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this gasket a genuine OEM part or an aftermarket equivalent?\u003c\/strong\u003e The 18-0878-9 is a Sierra-branded replacement gasket that is a direct equivalent for OEM number RM0003, not an OEM-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this gasket weigh?\u003c\/strong\u003e The 18-0878-9 thermostat gasket weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the thermostat gasket?\u003c\/strong\u003e Any time the thermostat cover is removed for inspection or thermostat replacement, the gasket should be replaced rather than reused, since a used gasket can leak even without visible damage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is this gasket used for?\u003c\/strong\u003e It seals the thermostat housing to prevent coolant leaks at the mating surface between the thermostat cover and the engine, and is identified by Sierra part number 18-0878-9.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I buy just one gasket instead of the pack of two?\u003c\/strong\u003e Part number 18-0878-9 is sold and priced only as a package of 2 gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket fit if my engine calls for OEM part RM0003?\u003c\/strong\u003e Yes, part number 18-0878-9 is the listed replacement for OEM number RM0003.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this part?\u003c\/strong\u003e Ordering 18-0878-9 gets you one package containing 2 thermostat gaskets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of engine part is this?\u003c\/strong\u003e The 18-0878-9 gasket is categorized as an engine accessory, specifically a thermostat gasket.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086042843,"sku":"SIE-18-0878-9","price":3.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0878_lg__90235.1692043126.500.750.jpg?v=1785329186","url":"https:\/\/www.goodvibesmarina.com\/products\/thermostat-cover-gasket-2-pack-replaces-rm0003-marine-engine","provider":"Good Vibes Marina","version":"1.0","type":"link"}