{"product_id":"sigma-812508612-fig-3463-ground-joint-union-1-in-fnpt-150lb","title":"Sigma 812508612 Fig 3463 Ground Joint Union 1 in Fnpt 150lb","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SIGMA 812508612 is a FIG 3463 ground joint pipe union rated for 150 lb service in malleable iron with a black finish. Ground joint unions create a metal-to-metal seat at the union nut, allowing piping sections to be connected and disconnected without disturbing the rest of the system. The female national pipe taper (FNPT) end connections accept standard tapered pipe threads on both sides. At 1 inch nominal size, this union fits common distribution piping found in gas, steam, and water systems. Licensed plumbers and pipefitters install this fitting as part of maintenance access points or equipment connections where future serviceability is required.\u003c\/p\u003e\u003cp\u003eThis union is suited for residential and light commercial piping applications including gas distribution, low-pressure steam, and hydronic heating systems. The malleable iron construction handles the thermal cycling and mechanical stress common in these systems. The black finish is standard for gas piping installations. The ground joint design provides a reliable shutoff face that can be remade in the field without replacement hardware.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eGround joint metal-to-metal seat allows field-serviceable connections without sealant at the union face\u003c\/li\u003e\n\u003cli\u003e150 lb pressure rating suitable for low-pressure gas, steam, and water service\u003c\/li\u003e\n\u003cli\u003e1 inch nominal FNPT threading on both ends for standard tapered pipe thread connections\u003c\/li\u003e\n\u003cli\u003eMalleable iron construction resists impact and thermal stress in cycling systems\u003c\/li\u003e\n\u003cli\u003eBlack finish meets standard requirements for gas piping identification\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement fitting for 1 inch nominal malleable iron pipe union applications in 150 lb rated gas, steam, and water piping systems.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed plumber or pipefitter in accordance with applicable local plumbing and mechanical codes, including IPC and IFGC requirements. Shut off and depressurize the piping system completely before disassembling or installing any union fitting. Apply appropriate thread sealant to the FNPT pipe threads but not to the ground joint union face, which relies on metal-to-metal contact for its seal. Pressure-test the assembly per code requirements after installation before returning the system to service.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFigure Number\u003c\/strong\u003e: FIG 3463\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Size\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Style\u003c\/strong\u003e: FNPT (Female National Pipe Taper)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: 150 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Malleable Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnion Type\u003c\/strong\u003e: Ground Joint\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SIGMA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 812508612\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SIGMA","offers":[{"title":"Default Title","offer_id":51523709239602,"sku":"BLU1I-LF","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0211824fb5b74af7a4106487a55dca8e.jpg?v=1785443603","url":"https:\/\/voomisupply.com\/products\/sigma-812508612-fig-3463-ground-joint-union-1-in-fnpt-150lb","provider":"Voomi Supply","version":"1.0","type":"link"}