{"product_id":"388-viton-o-ring-75a-durometer-19-in-id-durable-chemical-seal","title":"388 Viton O-Ring 75A Durometer, 19 in ID - Durable Chemical Seal","description":"\u003cp\u003eOur review of the 388 Viton O-ring finds it best suited for technicians, hobbyists, and maintenance crews who need a reliable replacement seal for fuel, hydraulic, or high-heat equipment. The bottom line: this pack of ten O-rings delivers consistent fit and chemical resistance because it uses genuine Viton fluorocarbon elastomer at a mid-range 75A hardness, making it a practical choice when heat, fuels, or solvents are present and a sturdy, repeatable seal is required.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Made from Viton fluorocarbon elastomer for broad resistance to fuels and many industrial solvents so the rings last longer in harsh environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -15 degrees F to 400 degrees F, allowing use across automotive, plumbing, and light aerospace temperature extremes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e 75A hardness offers a balance of flexibility and resistance to penetration, helping maintain a reliable seal under compression.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeometry:\u003c\/strong\u003e Round cross-section designed to seal between overlapping cylindrical surfaces, which aids compatibility with common valve and bottle fittings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e Manufactured to meet Aerospace Standard AS568A sizes, providing predictable dimensions for replacement and repair.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack size:\u003c\/strong\u003e Sold in a pack of ten, giving spare parts on hand for repeated maintenance tasks or multiple service points.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis product fits people who regularly service systems exposed to fuels, aromatic and aliphatic hydrocarbons, or silicone oils and need a robust seal that tolerates high temperature and vacuum conditions. It is particularly useful for repairs on fuel bottles, barrel seals, switchback components, and other cylindrical fittings where a precise O-ring dimension is required.\u003c\/p\u003e\u003cp\u003eThose who should look elsewhere include users whose systems are exposed primarily to alkalis, ammonia gas, low molecular organic acids, amines, glycol-based brake fluids, or super-heated steam, since Viton is known to be vulnerable to those substances and an alternative elastomer would be safer.\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 chemical resistance makes it dependable for fuel and solvent exposure.\u003c\/li\u003e\n\u003cli\u003eCustomers report reliable fit and leak resistance for items like fuel bottles and barrel seals.\u003c\/li\u003e\n\u003cli\u003ePack of ten provides value and spare parts for ongoing maintenance.\u003c\/li\u003e\n\u003cli\u003e75A durometer balances durability with enough flexibility for many sealing applications.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eNot suitable for environments dominated by ammonia, strong alkalis, or glycol-based brake fluids.\u003c\/li\u003e\n\u003cli\u003eHardness and material choice may be overkill for light domestic plumbing where softer compounds perform better.\u003c\/li\u003e\n\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\u003c\/td\u003e\n\u003ctd\u003e19 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter diameter\u003c\/td\u003e\n\u003ctd\u003e19-3\/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\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 388 Viton O-ring is a practical, cost-effective choice for professionals and informed hobbyists who need a durable seal for fuel, chemical, or high-temperature applications. Its Viton construction and 75A hardness deliver dependable leak resistance and longevity for the right environments, making the ten-pack a good value for routine maintenance and repairs.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan these O-rings handle gasoline and diesel?\u003c\/strong\u003e\u003cbr\u003eYes, Viton is compatible with many fuels and aromatic\/aliphatic hydrocarbons, so these rings are suitable for gasoline and diesel exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre they safe for high-temperature use?\u003c\/strong\u003e\u003cbr\u003eYes, they are rated for service from -15 degrees F up to 400 degrees F, making them appropriate for many high-heat applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill they work with brake fluid?\u003c\/strong\u003e\u003cbr\u003eNo, Viton is vulnerable to glycol-based brake fluids, so use a different elastomer for brake-system seals.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48609799176411,"sku":"B000FOLQ0O","price":200.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81iyYJCP7YL._SL1500_282c8825-612d-4658-b409-765f2378fffc.jpg?v=1778399931","url":"https:\/\/gearmusthave.com\/products\/388-viton-o-ring-75a-durometer-19-in-id-durable-chemical-seal","provider":"GearMustHave","version":"1.0","type":"link"}