{"product_id":"a-o-smith-100076303-fkm-o-ring-water-heater-seal","title":"A.o. Smith 100076303 Fkm O-ring Water Heater Seal","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe A.O. SMITH 100076303 is an FKM O-ring replacement seal designed for use in A.O. Smith tankless water heater units. FKM (fluoroelastomer) material provides strong resistance to heat, fuels, and water-borne chemicals, making it a reliable choice for sealing applications in high-temperature water heating systems. This O-ring maintains a leak-free seal at critical connection points within the unit. Licensed plumbers and HVAC technicians performing service, repair, or routine maintenance on compatible A.O. Smith tankless models will install this part.\u003c\/p\u003e\n\u003cp\u003eThis O-ring is specified for use across a broad range of A.O. Smith tankless water heaters, covering both natural gas (NG) and liquid propane (LP) configurations. It is used in residential and light commercial tankless models including indoor, outdoor, direct-vent, and open-combustion unit variants. Refer to the compatibility section for the full list of applicable model numbers provided by A.O. Smith.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eFKM (fluoroelastomer) construction for resistance to heat, fuels, and water\u003c\/li\u003e\n  \u003cli\u003eOEM replacement seal for A.O. Smith tankless water heaters\u003c\/li\u003e\n  \u003cli\u003eCompatible with both natural gas and liquid propane model variants\u003c\/li\u003e\n  \u003cli\u003eMaintains leak-free seal at internal connection points during service or repair\u003c\/li\u003e\n  \u003cli\u003eBroad cross-model fitment covering indoor, outdoor, direct-vent, and open-combustion units\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eCompatible with the following A.O. Smith tankless water heater models: T-M199 (NG), T-M50 (NG), T-H3M-DV (LP), T-H3J-DV (LP), T-M32 (LP), T-H1 (LP), T-H3S-DV (LP), TK-510C-NI (NG), T-H3-DV (LP), T-D2-OS (LP), T-M1 (LP), T-K3-SP (NG), T-H2-OS (NG), T-K3-OS (NG), T-D2-OS (NG), T-KJR2-IN (NG), T-M1 (NG), T-M199 (LP), T-H2-OS (LP), T-H2S-OS (LP), T-D2U-OS (NG), T-KJR (LP), TK-110U-E (NG\/LP), T-M50-ASME (NG), T-M50 (LP), T-K1S (LP), T-H3S-DV (NG), T-H2S-DV (LP), T-K4U-IN (NG), T-D2U-IN (NG), TK-310U-E (NG\/LP), T-K3-PRO (NG), T-M32 (NG), T-KD20 (LP), TK-510U-I (NG\/LP), T-KJR2-OS (LP), T-K4U-OS (NG), T-K4-OS (LP), T-K4-OS (NG), T-K3-PRO (LP), T-H3-DV (NG), T-H2-DV (LP), T-KJR2U-OS (NG), T-D2-IN (NG), T-H3J-OS (LP), T-H3M-DV (NG), TK-540P-NEH (NG), T-H1 (NG), T-K3 (NG), T-H2S-OS (NG), T-KJR (NG), T-M32-ASME (LP), T-D2-IN (LP), T-K2 (LP), T-H3-OS (LP), T-H3J-DV (NG), T-K4-IN (NG), T-H2S-DV (NG), T-K4-IN (LP), T-H3-OS (NG), T-H3M-OS (NG), TK-540P-PIH (LP), T-K3-OS (LP), TK-540P-NIH (NG), T-KJR2U-IN (NG), T-KJR2-OS (NG), TK-110C-NI (NG), TK-310U-I (NG\/LP), T-M50-ASME (LP), T-KJR2-IN (LP), T-K3-SP (LP), T-H3M-OS (LP), T-M32-ASME (NG), T-H2-DV (NG), T-H3J-OS (NG), TK-310C-NI (NG), TK-110U-I (NG\/LP), T-H3S-OS (LP), T-K2 (NG), TK-510U-E (NG\/LP), T-KD20 (NG), T-K1S (NG), TK-540P-PEH (LP), T-K3 (LP), T-H3S-OS (NG).\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed plumber or qualified service technician. Shut off the water supply and gas supply to the unit and allow the heater to cool fully before beginning any disassembly. Inspect the seating surface for debris or corrosion before installing the new O-ring to ensure a proper seal. Follow all applicable local plumbing codes and the manufacturer service documentation for the specific model being serviced.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Type\u003c\/strong\u003e: O-Ring\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: FKM (Fluoroelastomer)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: A.O. SMITH\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 100076303\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TAILWIND","offers":[{"title":"Default Title","offer_id":51149911032114,"sku":"100076303","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/305989327.jpg?v=1778602366","url":"https:\/\/voomisupply.com\/products\/a-o-smith-100076303-fkm-o-ring-water-heater-seal","provider":"Voomi Supply","version":"1.0","type":"link"}