{"product_id":"337-viton-o-ring-75a-3-in-id-3-3-8-in-od-pack-of-25-heat-and-fuel","title":"337 Viton O-Ring 75A 3 in ID 3-3\/8 in OD Pack of 25 - Heat and Fuel","description":"\u003cp\u003eIn this review the 337 Viton O-Ring is assessed for mechanical and fuel-system applications where chemical and heat resistance matter most. The bottom line: this pack of 25 O-rings is aimed at technicians, hobbyists, and maintenance staff who need a dependable seal that resists fuels and many solvents; the single biggest reason to buy is the Viton compound's combination of high temperature tolerance and chemical compatibility that keeps seals working under heat and contact with hydrocarbon fuels. The reviewer found these O-rings especially useful where durability and fit are required rather than a precision elastomer specialty.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Made of Viton fluorocarbon elastomer to provide strong resistance to many fuels and chemicals commonly encountered in industrial and field service work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Usable between -15 degrees F and 400 degrees F, which helps maintain sealing integrity from cold storage to high-heat engine or exhaust environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer 75A:\u003c\/strong\u003e A medium-hard shore rating that resists penetration and extrusion while still conforming enough to form a reliable seal on cylindrical mating surfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound cross-section:\u003c\/strong\u003e Traditional O-ring profile that provides an effective seal between overlapping cylindrical parts such as barrels, bottles, and pump housings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Supplied as a pack of 25 which offers good value for replacements and routine maintenance without frequent reordering.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis product suits maintenance technicians, DIY mechanics, and enthusiasts who replace seals in fuel systems, suppressors, hydraulic fittings, and older equipment where a robust fuel- and heat-resistant elastomer is required. It is also a practical choice for anyone who needs multiple spare O-rings for regular upkeep.\u003c\/p\u003e\u003cp\u003eThose who need compatibility with aggressive alkaline cleaners, glycol-based brake fluids, or super-heated steam should look for an alternate material; similarly, applications requiring extreme low-temperature flexibility below -15 degrees F or food-grade approvals are outside this O-ring's intended uses.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExcellent resistance to hydrocarbon fuels and many aromatic and aliphatic solvents, making it reliable in fuel-system repairs.\u003c\/li\u003e\n\u003cli\u003eHigh service temperature capability allows use near hot engines and exhaust components without rapid degradation.\u003c\/li\u003e\n\u003cli\u003ePack of 25 offers strong value for maintenance use and multiple projects.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eNot compatible with certain chemicals such as low molecular organic acids, strong bases, amines, and glycol-based brake fluids, so chemical compatibility must be confirmed before use.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eViton (fluorocarbon elastomer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInside diameter (ID)\u003c\/td\u003e\n\u003ctd\u003e3 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutside diameter (OD)\u003c\/td\u003e\n\u003ctd\u003e3-3\/8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCross-section \/ Width\u003c\/td\u003e\n\u003ctd\u003e3\/16 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e75A shore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-15 degrees F to 400 degrees F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe 337 Viton O-Ring pack is a practical, cost-effective choice for those replacing seals exposed to heat and common hydrocarbon fuels; the 75A hardness and wide temperature range deliver dependable performance for general service and fuel-system repairs. Buy this pack if you need durable, fuel-resistant O-rings in standard round form, but verify chemical compatibility for aggressive or alkaline fluids before use.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre these O-rings suitable for fuel pumps?\u003c\/strong\u003e\u003cbr\u003eYes; the Viton compound is compatible with many fuels and works well in non-flammable hydraulic and fuel pump applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill they hold up to engine heat?\u003c\/strong\u003e\u003cbr\u003eThey are rated to 400 degrees F and should handle most engine-adjacent heat exposure, though constant contact with super-heated steam is not recommended.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo they fit standard 3 in fittings?\u003c\/strong\u003e\u003cbr\u003eThe specified 3 in ID and 3-3\/8 in OD with 3\/16 in width match seals designed for overlapping cylindrical parts and should fit fittings sized for those dimensions.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48204418679003,"sku":"B000FMYT5U","price":80.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81iyYJCP7YL._SL1500_a5a4f243-6996-47b7-93d2-e6f7dfd2e1ee.jpg?v=1770235653","url":"https:\/\/gearmusthave.com\/products\/337-viton-o-ring-75a-3-in-id-3-3-8-in-od-pack-of-25-heat-and-fuel","provider":"GearMustHave","version":"1.0","type":"link"}