{"product_id":"mueller-streamline-521-403-black-malleable-iron-cap-1-2-in","title":"Mueller Streamline 521-403 Black Malleable Iron Cap 1\/2 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe MUELLER STREAMLINE 521-403 is a black malleable iron threaded cap rated for 150-pound service, designed to close off the end of a female iron pipe (FIP) threaded line. This fitting accepts a 1\/2-inch female thread and provides a secure, pressure-rated termination point for gas, air, or other compatible piping systems. Malleable iron construction offers reliable strength and durability in demanding trade environments. Plumbers, pipefitters, and mechanical contractors install this type of cap during rough-in, system testing, and permanent line termination applications.\u003c\/p\u003e\u003cp\u003eThis cap is suited for residential and light commercial piping installations where a threaded iron fitting is required to cap an open female-threaded pipe end. Common applications include natural gas distribution piping, compressed air lines, and general industrial piping systems. The 150-pound pressure rating makes it appropriate for standard low-to-medium pressure service conditions typical in these installations.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e150-pound pressure rating suitable for standard threaded iron pipe service\u003c\/li\u003e\n\u003cli\u003e1\/2-inch FIP (female iron pipe) thread for secure engagement on male-threaded pipe ends\u003c\/li\u003e\n\u003cli\u003eBlack malleable iron construction for strength and machinability\u003c\/li\u003e\n\u003cli\u003eThreaded design allows installation with standard pipe wrenches — no special tooling required\u003c\/li\u003e\n\u003cli\u003eProduced to exact dimensional specifications for consistent thread fit and seating\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-installation fitting compatible with standard 1\/2-inch male NPT threaded iron pipe in 150-pound-rated piping systems.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by licensed plumbers or pipefitters in accordance with applicable codes such as the International Fuel Gas Code (IFGC) or International Plumbing Code (IPC). Shut off and depressurize the affected line completely before installing or removing any threaded cap. Apply an appropriate thread sealant or PTFE tape to the male pipe threads before engagement. Hand-tighten first, then use a pipe wrench to achieve a leak-free connection without over-torquing the fitting.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Type\u003c\/strong\u003e: Cap\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Black Malleable Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: FIP (Female Iron Pipe)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Size\u003c\/strong\u003e: 1\/2 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: 150 lb\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: MUELLER STREAMLINE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 521-403\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MUELLER STREAMLINE","offers":[{"title":"Default Title","offer_id":51138308997426,"sku":"521-403","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/305532819.jpg?v=1778253044","url":"https:\/\/voomisupply.com\/products\/mueller-streamline-521-403-black-malleable-iron-cap-1-2-in","provider":"Voomi Supply","version":"1.0","type":"link"}