{"product_id":"bk-mueller-521-364hn-black-reducing-coupling-1-1-4x3-4","title":"Bk Mueller 521-364HN Black Reducing Coupling 1-1\/4x3\/4","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe BK MUELLER 521-364HN is a black malleable iron reducing coupling designed to connect pipes of two different diameters in threaded piping systems. The fitting transitions from a 1-1\/4 inch female iron pipe (FIP) thread to a 3\/4 inch FIP thread, allowing technicians to reduce line size without additional adapters. Rated at Class 150 with a liquid and gas pressure rating of 300 psi, this coupling suits moderate- to high-pressure gas and liquid distribution applications. The black finish is standard for gas piping systems. Licensed plumbers and pipefitters are the primary installers of this type of fitting.\u003c\/p\u003e\u003cp\u003eThis reducing coupling is used in residential and light commercial piping systems where a line size reduction is required at a threaded junction. Common applications include natural gas distribution, propane gas lines, and water supply systems. The FIP-threaded ends on both sides allow direct connection to male-threaded pipe or fittings without additional adapters. It is suited for new installations as well as repair and retrofit work on existing threaded pipe systems.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eReduces from 1-1\/4 inch to 3\/4 inch FIP thread in a single fitting\u003c\/li\u003e\n\u003cli\u003eMalleable iron construction provides strength and impact resistance in threaded piping systems\u003c\/li\u003e\n\u003cli\u003eClass 150 rating with 300 psi liquid and gas pressure rating\u003c\/li\u003e\n\u003cli\u003eBlack finish standard for gas piping identification and corrosion resistance\u003c\/li\u003e\n\u003cli\u003eFemale iron pipe (FIP) threads on both ends for straightforward connection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-installation fitting for threaded malleable iron piping systems using 1-1\/4 inch to 3\/4 inch FIP connections.\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 plumbing and mechanical codes. Shut off all gas or fluid supply and verify zero pressure in the line before disassembling or installing any threaded fitting. Apply an approved thread sealant or PTFE tape rated for the intended service  -  gas or liquid  -  before making up the joint. Do not overtighten, as malleable iron threads can crack under excessive torque.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Type\u003c\/strong\u003e: Reducing Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Size\u003c\/strong\u003e: 1-1\/4 x 3\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Connections\u003c\/strong\u003e: Threaded (FIP)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: FIP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Malleable Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassification\u003c\/strong\u003e: Class 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: 300 psi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.4 pounds\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 MUELLER\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 521-364HN\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"B\u0026K MUELLER","offers":[{"title":"Default Title","offer_id":67916724502834,"sku":"521-364HN","price":21.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3ee97df1196b1b5d0b95151bdb89bc25.jpg?v=1791258994","url":"https:\/\/voomisupply.com\/products\/bk-mueller-521-364hn-black-reducing-coupling-1-1-4x3-4","provider":"Voomi Supply","version":"1.0","type":"link"}