{"product_id":"nibco-b305256-cast-copper-companion-pipe-flange","title":"Nibco B305256 Cast Copper Companion Pipe Flange","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe NIBCO B305256 is a cast copper companion pipe flange rated for 125 psi service. It is designed to connect sections of copper piping using a companion flange pairing, creating a bolted joint that allows for easy disassembly and maintenance. This flange fits a 1\/2 inch pipe size and has an outer diameter of 3-1\/2 inches with bolt hole centers spaced 2-3\/8 inches apart. The end connection type is C (sweat), making it compatible with standard copper soldering practices. It is installed by licensed plumbers and pipefitters in both commercial and residential plumbing systems.\u003c\/p\u003e\n\u003cp\u003eThis flange is suited for low-pressure plumbing and hydronic systems where copper piping is the specified material. The companion style means it is paired with a matching flange on an adjoining pipe or fitting, bolted together to form a removable joint. Typical applications include water distribution, heating systems, and other fluid-handling installations where copper is required by specification or code. The sweat end connection requires standard torch soldering with appropriate copper flux and solder.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCast copper construction meets ASTM B584 standard for copper alloy sand castings\u003c\/li\u003e\n  \u003cli\u003eRated to 125 psi for reliable low-pressure service\u003c\/li\u003e\n  \u003cli\u003eSweat (C) end connection for standard copper soldering installation\u003c\/li\u003e\n  \u003cli\u003eCompanion flange style allows bolted, removable pipe joints\u003c\/li\u003e\n  \u003cli\u003e1\/2 inch pipe size with 3-1\/2 inch OD and 2-3\/8 inch bolt hole center spacing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation companion flange for 1\/2 inch copper piping systems rated at Class 125 with sweat end connections.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed plumber or pipefitter in accordance with applicable plumbing codes, including the IPC. Shut off the water supply and depressurize the system completely before beginning any soldering or flange work. Clean and flux all mating copper surfaces prior to soldering the sweat connection. Ensure the companion flange and its paired flange are properly aligned before torquing fasteners to avoid stress on the joint.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePipe Size\u003c\/strong\u003e: 1\/2 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Diameter\u003c\/strong\u003e: 3-1\/2 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBolt Hole Center Spacing\u003c\/strong\u003e: 2-3\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: 125 psi\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Connection\u003c\/strong\u003e: C (Sweat)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle\u003c\/strong\u003e: Companion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Cast Copper\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClass\u003c\/strong\u003e: 125\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard\u003c\/strong\u003e: ASTM B584\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.56 pounds\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: NIBCO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: B305256\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"NIBCO","offers":[{"title":"Default Title","offer_id":51538621628722,"sku":"B305256","price":163.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/cc1467afe2fe921e4c17c724babbc5ff.jpg?v=1785825342","url":"https:\/\/voomisupply.com\/products\/nibco-b305256-cast-copper-companion-pipe-flange","provider":"Voomi Supply","version":"1.0","type":"link"}