{"product_id":"bk-888-239-rubber-washer-dielectric-union","title":"Bk 888-239 Rubber Washer Dielectric Union","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe BK 888-239 is a replacement rubber washer designed for use with 1\/2 inch galvanized dielectric unions. Made from Buna-N rubber, this washer provides a reliable seal between the metal union components, helping to maintain the dielectric separation that prevents galvanic corrosion between dissimilar pipe materials. Plumbers and pipefitters install this washer as a service part when a worn or degraded washer allows leakage or compromises the union's insulating function. At 0.007 pounds, it is a lightweight, low-cost repair component stocked for routine service calls.\u003c\/p\u003e\u003cp\u003eThis washer is used in residential and light commercial plumbing systems wherever dielectric unions join copper and galvanized steel pipe. Common applications include water heater connections, boiler supply and return lines, and other mixed-metal piping configurations where electrolytic corrosion control is required. It is sold individually and is well-suited for keeping on hand as a standard service replacement.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBuna-N rubber construction for durability and chemical resistance in potable water service\u003c\/li\u003e\n\u003cli\u003eSized for 1\/2 inch dielectric unions\u003c\/li\u003e\n\u003cli\u003eDesigned as a direct replacement for worn or damaged union washers\u003c\/li\u003e\n\u003cli\u003eCompatible with Mueller, BK, and other standard dielectric union brands\u003c\/li\u003e\n\u003cli\u003eLightweight at 0.007 pounds for easy bulk stocking\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eFits Mueller, BK, and other standard brand 1\/2 inch galvanized dielectric unions. Confirm washer seat diameter before installation to ensure proper fitment with non-Mueller or non-BK union bodies.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eShut off the water supply and depressurize the line before disassembling the union. A licensed plumber should perform dielectric union service in jurisdictions requiring permitted plumbing work. Inspect the union seat for scoring or corrosion before installing the new washer, as a damaged seat will cause repeat leakage regardless of washer condition. Tighten the union nut to hand-snug plus firm wrench pressure without over-torquing, which can deform the rubber and reduce seal life.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize\u003c\/strong\u003e: 1\/2 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Buna-N rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.007 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUOM\u003c\/strong\u003e: Each\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC\u003c\/strong\u003e: 00032888882393\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: 888-239\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"B\u0026K","offers":[{"title":"Default Title","offer_id":51347227345202,"sku":"888-239","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310549945.jpg?v=1782099630","url":"https:\/\/voomisupply.com\/products\/bk-888-239-rubber-washer-dielectric-union","provider":"Voomi Supply","version":"1.0","type":"link"}