{"product_id":"matco-norca-dun-759mlf-3-4-inch-mxc-dielectric-union","title":"Matco-norca dun-759mlf 3\/4 Inch Mxc Dielectric Union","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe MATCO-NORCA dun-759mlf is a 3\/4-inch dielectric union designed to isolate dissimilar metals in a piping system and prevent galvanic corrosion at the joint. It features a male-by-coupling (MxC) end configuration, making it suited for connecting copper, steel, or other metallic pipe materials where electrochemical separation is required. Dielectric unions like this one are standard components in residential and commercial plumbing and mechanical systems, particularly at water heater connections and where ferrous and non-ferrous piping meet. Licensed plumbers and pipefitters install this fitting as part of code-compliant piping assemblies.\u003c\/p\u003e\u003cp\u003eThis fitting is commonly used at domestic water heater inlets and outlets, boiler supply and return connections, and other points in a plumbing or hydronic heating system where two different pipe metals join. The 3\/4-inch size covers the most common residential and light-commercial water heater connection size. The MxC configuration accommodates threaded male pipe on one end and a coupling connection on the other, providing installation flexibility in tight or retrofit situations.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDielectric insulation isolates dissimilar metals to prevent galvanic corrosion\u003c\/li\u003e\n\u003cli\u003e3\/4-inch size fits the most common residential water heater and boiler connection diameter\u003c\/li\u003e\n\u003cli\u003eMale-by-coupling (MxC) end configuration for versatile installation in threaded piping systems\u003c\/li\u003e\n\u003cli\u003eOEM-style replacement or new-installation fitting for plumbing and hydronic applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-installation dielectric union for residential and light-commercial plumbing and hydronic heating systems requiring a 3\/4-inch MxC dielectric connection.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed plumber in accordance with the applicable edition of the International Plumbing Code (IPC) or local plumbing code. Shut off the water supply and relieve system pressure before disassembling any piping joint. Use thread sealant or PTFE tape rated for potable water on all threaded connections. Do not overtighten the union nut, as excessive force can crack the dielectric sleeve and compromise electrical isolation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize\u003c\/strong\u003e: 3\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Configuration\u003c\/strong\u003e: Male x Coupling (MxC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Dielectric Union\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC\u003c\/strong\u003e: 082647092426\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: MATCO-NORCA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: dun-759mlf\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MATCO-NORCA","offers":[{"title":"Default Title","offer_id":51138393473330,"sku":"DUN-759MLF","price":38.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/305526650.jpg?v=1778255133","url":"https:\/\/voomisupply.com\/products\/matco-norca-dun-759mlf-3-4-inch-mxc-dielectric-union","provider":"Voomi Supply","version":"1.0","type":"link"}