{"product_id":"427-viton-o-ring-75a-durometer-4-3-4-in-id-pack-of-10","title":"427 Viton O-Ring 75A Durometer, 4-3\/4 in ID - Pack of 10","description":"\u003cp\u003eIn this review the 427 Viton O-Ring is assessed for workshops, maintenance techs, and anyone needing reliable seals in fuel or chemical environments; the single biggest reason to buy is its material choice, Viton, which offers broad chemical and temperature resistance that keeps seals intact where ordinary elastomers fail. The reviewer found these rings especially useful as replacements for fuel bottle and barrel seals, and appreciated that a pack of ten provides spare parts for repeat service without worrying about rapid degradation when exposed to heat, fuels, or ozone.\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 for extended resistance to fuels, aromatic and aliphatic hydrocarbons, and many chemicals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e Rated for use from -15 degrees F to 400 degrees F for reliable performance across most workshop and field conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 75A durometer provides a balance of compression resistance and flexibility to maintain a seal under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape and Fit:\u003c\/strong\u003e Round cross-section and precise 4-3\/4 in ID and 5-1\/4 in OD dimensions make it suitable for overlapping cylindrical surfaces and common replacement tasks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e Manufactured to the AS568A sizing standard so it matches established O-ring grooves and service parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack Quantity:\u003c\/strong\u003e Sold as a pack of 10 which reduces downtime and ensures spares are available for recurring maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis product suits technicians, DIY mechanics, and hobbyists who need a robust replacement O-ring for petroleum fuels, hydraulic fluids that are non-flammable, or applications exposed to heat, ozone, and vacuum. It is especially helpful for those repairing fuel bottle seals, firearm component seals, and similar cylindrical joints where a reliable Viton seal is required.\u003c\/p\u003e\u003cp\u003eIt is not the best choice for systems that contact low molecular weight organic acids, ammonia gas, alkalis, or glycol-based brake fluids, and users with those specific chemical exposures should select a compatible elastomer instead.\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 heat and fuel resistance thanks to Viton construction, keeping seals reliable in high-temperature service.\u003c\/li\u003e\n\u003cli\u003eDurable 75A hardness balances wear resistance with sealing ability, noted by customers for long life and leak resistance.\u003c\/li\u003e\n\u003cli\u003ePack of 10 provides good value and on-hand spares for repeat maintenance or multiple installations.\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 like low molecular organic acids, ammonia, amines, and glycol-based brake fluids, limiting its use in some systems.\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\u003eInner Diameter (ID)\u003c\/td\u003e\n\u003ctd\u003e4-3\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter (OD)\u003c\/td\u003e\n\u003ctd\u003e5-1\/4 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\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e75A\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 427 Viton O-Ring is a practical, cost-effective choice for users needing durable seals in fuel, heat, and ozone-exposed applications; buy it for its material resilience, standard sizing, and the convenience of a ten-pack. Those working with incompatible chemicals such as ammonia or glycol-based brake fluids should choose a different compound, but for general industrial sealing this is good value and dependable performance.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre these O-rings suitable for fuel systems?\u003c\/strong\u003e\u003cbr\u003eYes, Viton is compatible with many fuels, aromatic and aliphatic hydrocarbons, and non-flammable hydraulic fuels as noted.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo these match standard sizes?\u003c\/strong\u003e\u003cbr\u003eYes, they are produced to AS568A sizing and are intended to fit common O-ring grooves for the listed ID and OD.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan they be used with brake fluid?\u003c\/strong\u003e\u003cbr\u003eNo, Viton is vulnerable to glycol-based brake fluids and is not recommended for those systems.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48608502776027,"sku":"B000FMUW10","price":85.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81iyYJCP7YL._SL1500_53362766-aa38-4ed1-9059-0b834af54912.jpg?v=1778370327","url":"https:\/\/gearmusthave.com\/products\/427-viton-o-ring-75a-durometer-4-3-4-in-id-pack-of-10","provider":"GearMustHave","version":"1.0","type":"link"}