{"product_id":"328-viton-o-ring-75a-durometer-1-7-8in-id-2-1-4in-od-pack-of-25","title":"328 Viton O-Ring 75A Durometer 1-7\/8in ID 2-1\/4in OD - Pack of 25","description":"\u003cp\u003eIn this review the 328 Viton O-ring pack is judged as a practical replacement option for technicians and hobbyists who need reliable sealing in hot, chemical-exposed environments. The bottom line: buy this pack if you need a consistent, heat- and chemical-resistant seal in applications ranging from fuel fittings to vacuum systems, because the Viton compound and 75A durometer deliver durability and leak resistance without the premium cost of specialty parts.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Made of Viton fluorocarbon elastomer, this O-ring resists many fuels and chemicals typically encountered in hydraulic and fuel-system service, reducing material degradation over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -15 degrees F to 400 degrees F, the ring is suitable for high-heat engine bays and heated process lines while still performing in cold conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e The 75A hardness provides a balance of resilience and resistance to penetration, helping sustain a reliable seal under static compression.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForm factor:\u003c\/strong\u003e Round cross-section and precise dimensions ensure a proper seal between overlapping cylindrical surfaces such as bottle necks, barrels, and fittings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e Conformance to Aerospace Standard AS568A sizing means these O-rings match common industry replacement dimensions for straightforward swaps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack size:\u003c\/strong\u003e Supplied as a pack of 25, the set offers spare parts on hand for maintenance cycles or multiple installations, saving trips for single replacements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis product suits maintenance techs, gunsmiths, and DIY mechanics who service fuel bottles, hydraulic fittings, or devices exposed to fuels and aromatic hydrocarbons and need a resilient replacement O-ring in a common size. The pack is particularly useful where multiple identical seals are required or where parts are consumed during routine servicing.\u003c\/p\u003e\n\u003cp\u003eThose working with strong alkalis, ammonia, glycol-based brake fluids, or super-heated steam should look elsewhere or confirm chemical compatibility before use, since Viton is vulnerable to those specific substances and may degrade if exposed.\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 heat and chemical resistance for fuels, aromatic and aliphatic hydrocarbons, and many solvents.\u003c\/li\u003e\n\u003cli\u003eConsistent sizing to AS568A makes replacements easy and predictable for common assemblies.\u003c\/li\u003e\n\u003cli\u003eGood value: a 25-pack provides spares and reduces downtime during maintenance.\u003c\/li\u003e\n\u003cli\u003eCustomers report dependable fit and leak resistance in real-world uses such as fuel bottles and firearm seals.\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 low molecular organic acids, ammonia, certain alkalis, or glycol-based brake fluids, limiting use in some chemical systems.\u003c\/li\u003e\n\u003cli\u003e75A hardness may be firmer than desired for very low-pressure dynamic seals where softer compounds are preferred.\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\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\u003e1-7\/8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter (OD)\u003c\/td\u003e\n\u003ctd\u003e2-1\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth (Cross-section)\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\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 328 Viton O-ring pack is a sensible buy for anyone needing robust, heat- and fuel-resistant replacements in a common AS568A size. It provides dependable sealing and good value for maintenance kits, though users must verify compatibility when exposed to acids, amines, or glycol-based fluids.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these O-rings 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-system seals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat temperatures can they handle?\u003c\/strong\u003e\u003cbr\u003eThey are rated from -15 degrees F to 400 degrees F, making them usable in both cold and high-heat environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill they work with brake fluid or ammonia?\u003c\/strong\u003e\u003cbr\u003eNo; Viton is vulnerable to glycol-based brake fluids and ammonia gas, so these exposures should be avoided.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48632086266075,"sku":"B000FMYSP6","price":52.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81iyYJCP7YL._SL1500_93f88281-e631-4ee5-bef3-052d75705443.jpg?v=1778528779","url":"https:\/\/gearmusthave.com\/products\/328-viton-o-ring-75a-durometer-1-7-8in-id-2-1-4in-od-pack-of-25","provider":"GearMustHave","version":"1.0","type":"link"}