{"product_id":"bk-521-202bg-3-8-in-malleable-black-iron-coupling","title":"Bk 521-202BG 3\/8 in Malleable Black Iron Coupling","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe BK 521-202BG is a 3\/8-inch malleable black iron coupling designed for threaded pipe connections in gas, air, and general-purpose piping systems. Manufactured from malleable iron conforming to ANSI\/ASTM A-197, this coupling provides reliable joining of same-diameter pipe runs. Dimensions conform to ANSI\/ASME B16.3, B16.14, and B16.39 standards, and threads are cut to ANSI B1.20.1 NPT specification. Each fitting is individually flag tagged and 100% inspected and quality tested before leaving the factory. The Mueller logo is cast into the body of each fitting. Licensed plumbers and pipefitters are the typical installers for this type of fitting.\u003c\/p\u003e\n\u003cp\u003eThis coupling is suited for residential and light commercial piping installations where a straight, threaded union between two pipe sections is required. Common applications include gas distribution piping, compressed air lines, and general black iron pipe assemblies. The black iron finish makes it appropriate for gas service where coating or galvanizing is not required. Sold individually, with a minimum order quantity of 5 units.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eMalleable black iron construction per ANSI\/ASTM A-197 for durability in threaded piping systems\u003c\/li\u003e\n  \u003cli\u003e3\/8-inch NPT threads conforming to ANSI B1.20.1 for reliable, leak-resistant connections\u003c\/li\u003e\n  \u003cli\u003eDimensional compliance with ANSI\/ASME B16.3, B16.14, and B16.39\u003c\/li\u003e\n  \u003cli\u003e100% inspected and quality tested at the factory\u003c\/li\u003e\n  \u003cli\u003eIndividually flag tagged for easy identification on the job\u003c\/li\u003e\n  \u003cli\u003eMueller logo cast into the fitting body for manufacturer traceability\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 for standard 3\/8-inch NPT threaded black iron pipe 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 local codes and the International Fuel Gas Code (IFGC) or International Plumbing Code (IPC) where applicable. Shut off and depressurize the pipe system fully before disassembling any threaded connections. Apply an approved pipe thread sealant or PTFE tape rated for the intended service medium before making up the joint. Do not over-tighten threaded malleable iron fittings, as this can crack the fitting body.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Malleable Black Iron, ANSI\/ASTM A-197\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: ANSI B1.20.1 NPT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensional Standard\u003c\/strong\u003e: ANSI\/ASME B16.3, B16.14, B16.39\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePipe Size\u003c\/strong\u003e: 3\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.131 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSold As\u003c\/strong\u003e: Each\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 5\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\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 521-202BG\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"B\u0026K","offers":[{"title":"Default Title","offer_id":51344559833394,"sku":"521-202BG","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310549907.jpg?v=1782036957","url":"https:\/\/voomisupply.com\/products\/bk-521-202bg-3-8-in-malleable-black-iron-coupling","provider":"Voomi Supply","version":"1.0","type":"link"}