{"product_id":"sigma-812509610-fig-3463-ground-joint-pipe-union-3-in-fnpt","title":"Sigma 812509610 Fig 3463 Ground Joint Pipe Union 3 in Fnpt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SIGMA 812509610 is a FIG 3463 ground joint pipe union rated for 150 lb service in malleable iron with a black oxide finish. Ground joint unions provide a metal-to-metal seat that resists leakage under pressure, making them a standard fitting in gas piping, steam systems, and industrial plumbing installations. The 3 inch nominal size and female NPT (FNPT) end connections on both the nut and tail piece allow straight-in thread engagement on standard pipe. Licensed plumbers and pipefitters install this fitting where a section of pipe must be periodically disconnected and reconnected without disturbing the rest of the run.\u003c\/p\u003e\u003cp\u003eThis union is suited for residential and commercial mechanical rooms, boiler rooms, and industrial process piping where malleable iron fittings are specified. The 150 lb pressure class aligns with standard black iron gas distribution and low-pressure steam piping applications. The black oxide surface treatment provides a uniform appearance consistent with other black iron system components and offers basic corrosion resistance in dry indoor environments. It is imported and conforms to the dimensional standards expected of FIG 3463 pattern ground joint unions.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e3 inch nominal size with FNPT end connections for standard pipe thread engagement\u003c\/li\u003e\n\u003cli\u003e150 lb pressure class suitable for gas, steam, and low-pressure fluid service\u003c\/li\u003e\n\u003cli\u003eGround joint metal-to-metal seat provides a reliable, reusable seal\u003c\/li\u003e\n\u003cli\u003eMalleable iron construction handles mechanical stress and thermal cycling common in piping systems\u003c\/li\u003e\n\u003cli\u003eBlack oxide finish matches standard black iron piping assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and standard-service fitting for 3 inch malleable iron black iron piping systems using NPT threaded connections at the 150 lb pressure class.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed plumber or pipefitter in accordance with applicable plumbing and mechanical codes, including the IPC and IFGC where gas service is involved. Shut off and depressurize the system completely before removing or installing any union fitting. Apply appropriate thread sealant rated for the service medium to all NPT connections. Do not overtighten the union nut, as the ground joint seat requires only firm hand-plus-wrench engagement to seal properly.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Size\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Style\u003c\/strong\u003e: FNPT (Female National Pipe Thread)\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 Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFigure Number\u003c\/strong\u003e: FIG 3463\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePattern\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: 812509610\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SIGMA","offers":[{"title":"Default Title","offer_id":51523380117810,"sku":"BLU3I-LF","price":49.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e78c6426e972071a3f13ccf13bebe905.jpg?v=1785441295","url":"https:\/\/voomisupply.com\/products\/sigma-812509610-fig-3463-ground-joint-pipe-union-3-in-fnpt","provider":"Voomi Supply","version":"1.0","type":"link"}