{"product_id":"444-viton-o-ring-75a-durometer-7-3-4in-id-8-1-4in-od-pack-of-25","title":"444 Viton O-Ring 75A Durometer 7-3\/4in ID 8-1\/4in OD Pack of 25","description":"\u003cp\u003eIn this review the 444 Viton O-ring is presented for technicians, maintenance crews, and DIYers who need a dependable seal for fuel, chemical, and high-heat applications; the single biggest reason to buy is its material performance - made from fluorocarbon Viton it resists fuels, aromatic and aliphatic hydrocarbons, ozone and weathering up to 400 degrees F while maintaining shape and leak resistance. The pack of 25 provides value for repeated repairs or projects where consistent size and hardness matter, and customers who need a certified standard fit will appreciate that this O-ring follows the AS568A sizing convention.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eViton construction:\u003c\/strong\u003e Provides strong resistance to fuels, silicone oil, chlorinated hydrocarbons and many solvents, reducing seal failures in chemical environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide temperature range:\u003c\/strong\u003e Rated from -15 degrees F to 400 degrees F so it can be used in systems exposed to heat or cold without rapid degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e75A durometer:\u003c\/strong\u003e The medium-hard shore durometer offers a balance of compression resistance and elasticity for reliable sealing under pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound cross-section:\u003c\/strong\u003e A classic O-ring profile that creates a tight seal between overlapping cylindrical surfaces and is simple to install or replace.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Supplied as a pack of 25 which lowers per-unit cost and keeps spare parts on hand for routine maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThese O-rings suit industrial maintenance staff, hydraulics and pneumatics technicians, and hobbyists who work with fuel systems, vacuum equipment, or heat-exposed seals; the chemical compatibility and temperature tolerance make them a practical choice for non-flammable hydraulic fuels, aromatic and aliphatic hydrocarbons, and high-vacuum setups. The standardized sizing also helps anyone replacing common factory seals like bottle or barrel seals that accept AS568A sizes.\u003c\/p\u003e\u003cp\u003eThose who should look elsewhere include users needing compatibility with glycol-based brake fluids, strong alkalis, ammonia gas, or super-heated steam, since Viton is vulnerable to those fluids. For applications requiring extreme low-temperature flexibility below -15 degrees F or specific approvals for food or potable water, select a material rated for those conditions.\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 chemical and fuel resistance for a wide range of service environments.\u003c\/li\u003e\n\u003cli\u003eMaintains integrity across a broad temperature span, up to 400 degrees F.\u003c\/li\u003e\n\u003cli\u003eConsistent 75A hardness gives good durability and leak resistance in routine service.\u003c\/li\u003e\n\u003cli\u003ePack of 25 provides good value for repairs and replacements.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eNot compatible with glycol-based brake fluids, strong alkalis, amines, or super-heated steam.\u003c\/li\u003e\n\u003cli\u003e75A hardness may be firmer than desired for some ultra-low pressure or delicate sealing surfaces.\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\u003e7-3\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter diameter\u003c\/td\u003e\n\u003ctd\u003e8-1\/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 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 444 Viton O-ring is a practical, cost-effective choice for anyone needing a reliable seal against fuels, many solvents and heat. Its 75A hardness and AS568A sizing make it a durable replacement part for industrial and maintenance uses, and the 25-pack offers ready spares for ongoing service; avoid it where glycol-based fluids or strong alkalis are present.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan these O-rings be used with gasoline and aromatic fuels?\u003c\/strong\u003e\u003cbr\u003eYes, Viton is compatible with fuels and aromatic hydrocarbons, making these suitable for many fuel system seals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 75A hardness affect sealing in low-pressure applications?\u003c\/strong\u003e\u003cbr\u003eThe 75A durometer is firmer than softer elastomers and may be less forgiving in very low-pressure or delicate interfaces; evaluate fit and compression for sensitive seals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo these O-rings meet a standard size system?\u003c\/strong\u003e\u003cbr\u003eYes, the sizing aligns with the AS568A standard, which helps ensure compatibility with common OEM seals.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48651093278939,"sku":"B000FOLP14","price":314.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81iyYJCP7YL._SL1500_bce78b55-6b2f-4139-941a-f52f60ac3dfc.jpg?v=1778608608","url":"https:\/\/gearmusthave.com\/products\/444-viton-o-ring-75a-durometer-7-3-4in-id-8-1-4in-od-pack-of-25","provider":"GearMustHave","version":"1.0","type":"link"}