{"product_id":"armstrong-8as1270-243-epdm-o-ring-4-109-id-x-0-139-cs","title":"Armstrong 8as1270-243 Epdm O-ring 4.109 Id X 0.139 Cs","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ARMSTRONG 8as1270-243 is an EPDM O-ring designed for use in HVAC and fluid-handling assemblies where a reliable elastomeric seal is required. EPDM (ethylene propylene diene monomer) compound offers good resistance to water, steam, and many common HVAC system fluids, making it a practical choice for sealing applications in air handling and hydronic equipment. This O-ring measures 4.109 inches inner diameter with a 0.139-inch cross section, conforming to standard O-ring sizing conventions. It is typically installed by HVAC technicians and plumbers performing maintenance, repair, or component replacement on compatible Armstrong equipment.\u003c\/p\u003e\u003cp\u003eThis O-ring is suited for residential and light commercial HVAC applications, including air handler components and accessories within Armstrong product lines. It is commonly used when servicing assemblies that require a compression seal at a mating groove or port. The EPDM material is appropriate for moderate-temperature water and steam service typical of HVAC hydronic and air-side equipment. Technicians should verify groove dimensions match the 4.109-inch ID and 0.139-inch cross section before installation.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eEPDM compound provides resistance to water, steam, and common HVAC system fluids\u003c\/li\u003e\n\u003cli\u003e4.109-inch inner diameter suits standard large-bore O-ring grooves\u003c\/li\u003e\n\u003cli\u003e0.139-inch cross section conforms to AS568 and equivalent sizing standards\u003c\/li\u003e\n\u003cli\u003eOEM Armstrong part for direct replacement in compatible assemblies\u003c\/li\u003e\n\u003cli\u003eElastomeric construction allows uniform compression sealing in mating grooves\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement O-ring for Armstrong HVAC room air parts and accessories assemblies requiring a 4.109-inch ID by 0.139-inch cross section EPDM seal.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified HVAC technician or plumber. Power down and depressurize the system before removing any components or existing seals. Inspect the mating groove for damage, debris, or corrosion before seating the new O-ring, and avoid using sharp tools that could nick the elastomer. Lightly lubricating the O-ring with a compatible grease prior to installation helps prevent tearing during assembly.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: EPDM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter\u003c\/strong\u003e: 4.109 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross Section\u003c\/strong\u003e: 0.139 inches\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: ARMSTRONG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 8as1270-243\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ARMSTRONG AIR","offers":[{"title":"Default Title","offer_id":51161734316338,"sku":"8AS1270-243","price":35.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/306260030.jpg?v=1778880113","url":"https:\/\/voomisupply.com\/products\/armstrong-8as1270-243-epdm-o-ring-4-109-id-x-0-139-cs","provider":"Voomi Supply","version":"1.0","type":"link"}