{"product_id":"bk-521-206bg-malleable-black-iron-coupling-1-1-4-in","title":"Bk 521-206BG Malleable Black Iron Coupling 1-1\/4 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe BK 521-206BG is a 1-1\/4-inch malleable black iron coupling designed for joining threaded pipe sections in gas, water, and general piping systems. Manufactured from malleable iron conforming to ANSI\/ASTM A-197, the fitting meets dimensional standards ANSI\/ASME B16.3, B16.14, and B16.39, with threads cut to ANSI B1.20.1 NPT specification. Each fitting is individually flag tagged and 100% inspected at the factory. The Mueller logo is cast directly into the body. Plumbers, pipefitters, and HVAC technicians use this coupling in both residential and light commercial installations where a straight, same-size pipe connection is required.\u003c\/p\u003e\u003cp\u003eThe 521-206BG is suited for use in threaded black iron piping systems, including natural gas distribution, compressed air lines, and steam or water piping where black iron fittings are specified. The 1-1\/4-inch size is common in branch and main-line runs in residential and small commercial mechanical rooms. Sold individually, making it practical for service calls and small repair jobs without requiring a bulk purchase.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMalleable iron construction per ANSI\/ASTM A-197 for strength and machinability\u003c\/li\u003e\n\u003cli\u003eDimensions conform to ANSI\/ASME B16.3, B16.14, and B16.39\u003c\/li\u003e\n\u003cli\u003eNPT threads per ANSI B1.20.1 for reliable sealed connections\u003c\/li\u003e\n\u003cli\u003e100% factory inspected and quality tested\u003c\/li\u003e\n\u003cli\u003eIndividually flag tagged for easy identification and inventory management\u003c\/li\u003e\n\u003cli\u003eMueller logo cast into body for quick brand verification on the job\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-installation fitting for 1-1\/4-inch NPT threaded black iron piping systems in gas, steam, air, and water applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, the International Fuel Gas Code (IFGC), or the International Plumbing Code (IPC) as required by the system type. Shut off and depressurize the line before disassembling any existing fittings. Apply an approved pipe thread sealant or PTFE tape rated for the intended service medium before making up the joint. Do not over-tighten; use a pipe wrench with a backup wrench on the mating component to avoid stressing adjacent fittings.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\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\u003eSize\u003c\/strong\u003e: 1-1\/4 inches\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 Standards\u003c\/strong\u003e: ANSI\/ASME B16.3, B16.14, B16.39\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.682 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold As\u003c\/strong\u003e: Each\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 521-206BG\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"B\u0026K","offers":[{"title":"Default Title","offer_id":51345188192562,"sku":"521-206BG","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310549903.jpg?v=1782051272","url":"https:\/\/voomisupply.com\/products\/bk-521-206bg-malleable-black-iron-coupling-1-1-4-in","provider":"Voomi Supply","version":"1.0","type":"link"}