{"product_id":"bk-mueller-511-203hn-malleable-iron-pipe-coupling-1-2-in","title":"Bk Mueller 511-203HN Malleable Iron Pipe Coupling 1\/2 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe BK MUELLER 511-203HN is a Class 150 malleable iron pipe coupling designed for threaded pipe connections in liquid, gas, and steam service lines. Rated at 300 psi for liquid and gas applications and 150 psi for steam, this galvanized fitting delivers reliable mechanical integrity in demanding service environments. The 1\/2-inch threaded end connection makes it compatible with standard NPT piping systems. Plumbers, pipefitters, and mechanical contractors install this type of coupling when joining two sections of threaded pipe in a straight run, particularly in commercial and industrial piping assemblies.\u003c\/p\u003e\n\u003cp\u003eThis coupling is suited for residential and light commercial plumbing, gas distribution piping, and steam systems where a Class 150 malleable iron fitting is required. The galvanized finish provides corrosion resistance in exposed or moisture-prone installations. Typical applications include natural gas supply lines, hydronic heating systems, compressed air distribution, and general-purpose liquid piping. Its threaded end connection allows for tool-based installation without welding or soldering.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e300 psi liquid and gas pressure rating for high-demand service lines\u003c\/li\u003e\n  \u003cli\u003e150 psi steam pressure rating suitable for low-pressure steam systems\u003c\/li\u003e\n  \u003cli\u003e1\/2-inch threaded (NPT) end connection for standard pipe fitting\u003c\/li\u003e\n  \u003cli\u003eClass 150 malleable iron construction for strength and durability\u003c\/li\u003e\n  \u003cli\u003eGalvanized finish for corrosion resistance in wet or exposed environments\u003c\/li\u003e\n  \u003cli\u003eStraight coupling design joins two pipe sections in a continuous run\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement and standard-fit coupling for 1\/2-inch NPT threaded malleable iron pipe systems in liquid, gas, and low-pressure steam service.\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 local mechanical and plumbing codes. Shut off all gas or liquid supply and depressurize the line completely before disassembling or replacing any fitting. Apply an appropriate thread sealant or PTFE tape to the male threads before assembly, and tighten using pipe wrenches to achieve a leak-free joint. Do not over-tighten malleable iron fittings, as the material can crack under excessive torque.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitting Type\u003c\/strong\u003e: Coupling\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitting Size\u003c\/strong\u003e: 1\/2 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Malleable Iron\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Connection\u003c\/strong\u003e: Threaded\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLiquid and Gas Pressure Rating\u003c\/strong\u003e: 300 psi\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSteam Pressure Rating\u003c\/strong\u003e: 150 psi\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClass\u003c\/strong\u003e: 150\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish Coating\u003c\/strong\u003e: Galvanized\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.5 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: BK MUELLER\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 511-203HN\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"B\u0026K MUELLER","offers":[{"title":"Default Title","offer_id":67918373683506,"sku":"511-203HN","price":16.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a18033eb7b5f04b4475a98633fc1582f.jpg?v=1791269472","url":"https:\/\/voomisupply.com\/products\/bk-mueller-511-203hn-malleable-iron-pipe-coupling-1-2-in","provider":"Voomi Supply","version":"1.0","type":"link"}