{"product_id":"bk-521-921bg-black-iron-hex-bushing-3-8-x-1-4-inch","title":"Bk 521-921BG Black Iron Hex Bushing 3\/8 X 1\/4 Inch","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe BK 521-921BG is a hexagon pipe bushing made from black malleable iron, used to reduce a 3\/8 inch male NPT thread down to a 1\/4 inch female NPT thread. This type of reducing bushing is a standard component in low-pressure gas piping, compressed air lines, and general plumbing distribution systems. The hex body allows wrench engagement for proper tightening without slipping. Each fitting ships individually flag tagged and carries the Mueller logo cast directly into the body. Material meets ANSI\/ASTM A-197 and threads conform to ANSI B1.20.1 for reliable, leak-resistant connections.\u003c\/p\u003e\n\u003cp\u003eThis bushing is suited for residential and light commercial piping applications where a threaded iron reduction is needed between dissimilar pipe sizes. Typical install scenarios include gas appliance supply lines, air compressor fittings, and black iron piping manifolds. The hex profile seats into standard pipe fitting layouts and is interchangeable with other malleable iron fittings of the same thread specification. Sold individually.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBlack malleable iron construction meets ANSI\/ASTM A-197 material standard\u003c\/li\u003e\n  \u003cli\u003e3\/8 inch male NPT x 1\/4 inch female NPT reducing configuration\u003c\/li\u003e\n  \u003cli\u003eHex body design allows wrench engagement for secure installation\u003c\/li\u003e\n  \u003cli\u003eThreads conform to ANSI B1.20.1 for consistent fit with standard NPT fittings\u003c\/li\u003e\n  \u003cli\u003eDimensions comply with ANSI\/ASME B16.14 and B16.39\u003c\/li\u003e\n  \u003cli\u003e100 percent inspected and quality tested at the factory\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or standard addition for black iron threaded piping systems requiring a 3\/8 inch to 1\/4 inch NPT reduction.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by licensed plumbers or gas fitters depending on the application and local code requirements. Shut off all gas or air supply and relieve system pressure before threading or unthreading any fitting. Apply an approved pipe thread sealant or PTFE tape to male threads before assembly. Do not overtighten 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\u003eMaterial\u003c\/strong\u003e: Black Malleable Iron\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Standard\u003c\/strong\u003e: ANSI\/ASTM A-197\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: ANSI B1.20.1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimension Standard\u003c\/strong\u003e: ANSI\/ASME B16.14, B16.39\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMale Thread Size\u003c\/strong\u003e: 3\/8 inch NPT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFemale Thread Size\u003c\/strong\u003e: 1\/4 inch NPT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.04 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSold As\u003c\/strong\u003e: Each\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: 521-921BG\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"B\u0026K","offers":[{"title":"Default Title","offer_id":51347419365682,"sku":"521-921BG","price":17.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310549883.jpg?v=1782104360","url":"https:\/\/voomisupply.com\/products\/bk-521-921bg-black-iron-hex-bushing-3-8-x-1-4-inch","provider":"Voomi Supply","version":"1.0","type":"link"}