{"product_id":"bk-mueller-511-805hp-malleable-iron-square-plug-1-inch","title":"Bk Mueller 511-805HP Malleable Iron Square Plug 1 Inch","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe BK MUELLER 511-805HP is a malleable iron square plug fitting designed to close off threaded pipe ends in piping systems carrying liquid, gas, or steam. Rated at 300 psi for liquid and gas service and 150 psi for steam, this Class 150 fitting delivers reliable sealing performance across a wide range of pressures. The galvanized finish provides corrosion resistance for longevity in demanding environments. At 1 inch in size with a threaded end connection, it installs quickly into standard female pipe threads. Plumbers, pipefitters, and mechanical contractors commonly use square plugs like this to cap unused branch outlets, test ports, or service ports during installation and maintenance work.\u003c\/p\u003e\n\u003cp\u003eThis fitting is suited for residential and light commercial piping systems where liquid, gas, or low-pressure steam lines require a secure threaded closure. It is a practical choice for capping iron pipe runs during pressure testing, isolating unused tee branches, or permanently closing off ports after system modifications. The malleable iron construction handles the mechanical stress of wrench-tightened connections without cracking, making it appropriate for in-wall, below-slab, or mechanical-room installations where vibration or thermal cycling may be present.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eMalleable iron construction resists cracking under wrench torque and thermal cycling\u003c\/li\u003e\n  \u003cli\u003eGalvanized finish provides corrosion resistance for extended service life\u003c\/li\u003e\n  \u003cli\u003eRated 300 psi for liquid and gas service\u003c\/li\u003e\n  \u003cli\u003eRated 150 psi for steam service\u003c\/li\u003e\n  \u003cli\u003eThreaded end connection for straightforward installation into female pipe threads\u003c\/li\u003e\n  \u003cli\u003eClass 150 fitting meeting standard pipe fitting classifications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation fitting compatible with standard 1 inch female threaded malleable iron or steel pipe fittings in Class 150 piping systems.\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 codes such as the IPC or IFGC. Shut off and depressurize the piping system completely before removing or installing any fitting. Apply thread sealant or PTFE tape to the male threads before tightening to achieve a leak-free seal. Tighten using a pipe wrench on the square drive head; do not over-tighten, as this can damage threads or the fitting body.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitting Type\u003c\/strong\u003e: Square Plug\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitting Size\u003c\/strong\u003e: 1 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 pound\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: 511-805HP\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"B\u0026K MUELLER","offers":[{"title":"Default Title","offer_id":67906015068466,"sku":"511-805HP","price":19.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/361a619ae847a1ef15cafb502600fd6d.jpg?v=1791162661","url":"https:\/\/voomisupply.com\/products\/bk-mueller-511-805hp-malleable-iron-square-plug-1-inch","provider":"Voomi Supply","version":"1.0","type":"link"}