{"product_id":"412-o-ring-viton-75a-2-7-8-in-id-3-3-8-in-od-durable-chemical-seal","title":"412 O-Ring Viton 75A 2-7\/8 in ID 3-3\/8 in OD - Durable Chemical Seal","description":"\u003cp\u003eIn this review the 412 O-Ring made of Viton is evaluated for routine and demanding sealing tasks; the bottom line is that it is best suited for users who need a heat- and fuel-resistant replacement O-ring with predictable hardness and size. The reviewer found the pack of five particularly useful for maintenance work where matching exact dimensions matters, and highlights the material's resistance to fuels, aromatic and aliphatic hydrocarbons, and high temperatures as the single biggest reason to buy. Its 75A durometer delivers a firm but flexible gasket that holds compression on cylindrical overlaps without squishing out too quickly.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eViton compound:\u003c\/strong\u003e Resists fuels, many chemicals and ozone so seals last longer in oil- and fuel-exposed installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e75A durometer:\u003c\/strong\u003e Provides a balance of firmness and elasticity to maintain a reliable seal under compression and thermal cycling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard AS568A size:\u003c\/strong\u003e The 2-7\/8 in ID and 3-3\/8 in OD match common aerospace and equipment dimensions for easy replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide temperature range:\u003c\/strong\u003e Rated from -15 degrees F to 450 degrees F so it performs in cold storage and high-heat engine zones.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound cross-section:\u003c\/strong\u003e Designed to seal between cylindrical overlapping surfaces for predictable compression and leak resistance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis product is ideal for technicians, mechanical hobbyists, and equipment maintainers who need a repeatable, chemically resistant O-ring in a standard AS568A size. The pack format suits workshops that replace seals regularly on fuel bottles, firearms components, hydraulic fittings, or vacuum systems where Viton compatibility is required.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include users needing compatibility with strong alkalis, ammonia gas, glycol-based brake fluids, or super-heated steam, because Viton is vulnerable to those media. If an ultra-soft seal or a different cross-section is required, choose a different material or profile.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExcellent chemical and fuel resistance for long life in oil- and fuel-exposed applications.\u003c\/li\u003e\n\u003cli\u003eGood heat tolerance so it holds up around engines and hot process equipment.\u003c\/li\u003e\n\u003cli\u003eCorrect AS568A dimensions and firm 75A hardness deliver reliable fit and leak resistance.\u003c\/li\u003e\n\u003cli\u003ePack of five gives value for repeat maintenance or multiple installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot compatible with strong alkalis, ammonia, certain amines or glycol-based brake fluids, limiting use in some brake or chemical systems.\u003c\/li\u003e\n\u003cli\u003e75A hardness may be too stiff for applications that require a very soft, low-compression seal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\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\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e75A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInside Diameter (ID)\u003c\/td\u003e\n\u003ctd\u003e2-7\/8 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\u003e1\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-15 degrees F to 450 degrees F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eMeets AS568A size standard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 412 Viton O-ring is a practical, value-oriented choice for anyone needing a durable, heat- and fuel-resistant seal in a common AS568A size; its 75A hardness and pack of five make it especially useful for replacements on fuel bottles, firearm seals, and hydraulic fittings. It is not the right choice where alkali or glycol brake fluid resistance is required, but for typical fuel and high-temperature sealing it represents good value.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this O-ring suitable for fuel applications?\u003c\/strong\u003e\u003cbr\u003eYes, Viton is compatible with many fuels, aromatic and aliphatic hydrocarbons, and is commonly used in fuel-handling seals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this O-ring withstand high temperatures?\u003c\/strong\u003e\u003cbr\u003eYes, it is rated for use from -15 degrees F up to 450 degrees F, so it tolerates most engine and hot-process environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used with brake fluid or ammonia?\u003c\/strong\u003e\u003cbr\u003eNo, Viton is vulnerable to glycol-based brake fluids, ammonia gas, certain amines and strong alkalis, so avoid those media.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48244863500507,"sku":"B00M8YVTAG","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81iyYJCP7YL._SL1500_2ac590c5-8612-47bb-9d1a-264f86c56fb1.jpg?v=1771098597","url":"https:\/\/gearmusthave.com\/products\/412-o-ring-viton-75a-2-7-8-in-id-3-3-8-in-od-durable-chemical-seal","provider":"GearMustHave","version":"1.0","type":"link"}