{"product_id":"weil-mclain-511-246-392","title":"Weil McLain 511-246-392 Drain Valve","description":"\u003cp\u003eThe \u003cstrong\u003eWeil McLain 511-246-392\u003c\/strong\u003e is an OEM \u003cstrong\u003e3\/4-inch NPT boiler drain valve\u003c\/strong\u003e used to \u003cstrong\u003edrain\u003c\/strong\u003e, \u003cstrong\u003eflush\u003c\/strong\u003e and \u003cstrong\u003eservice hydronic heating systems\u003c\/strong\u003e on select \u003cstrong\u003eWeil McLain residential and light commercial boilers\u003c\/strong\u003e. The photo shows a solid \u003cstrong\u003ebrass\u003c\/strong\u003e valve body with a blue painted \u003cstrong\u003ewheel handle\u003c\/strong\u003e, a hex \u003cstrong\u003epacking nut\u003c\/strong\u003e around the stem, a \u003cstrong\u003emale pipe-thread inlet\u003c\/strong\u003e on the bottom and an \u003cstrong\u003eangled outlet with external threads\u003c\/strong\u003e for a hose connection. Installed at the \u003cstrong\u003elow point of the boiler\u003c\/strong\u003e, it gives the technician a controlled way to empty the vessel or flush out sediment without opening up the piping.\u003c\/p\u003e\n\n\u003cp\u003eA boiler drain is a small part that does a lot of work. Closed, it keeps the system water inside the boiler under \u003cstrong\u003eoperating pressure\u003c\/strong\u003e; open, it lets you attach a \u003cstrong\u003ehose\u003c\/strong\u003e and drain the boiler for \u003cstrong\u003eservice\u003c\/strong\u003e, \u003cstrong\u003eflush\u003c\/strong\u003e out \u003cstrong\u003esediment\u003c\/strong\u003e and \u003cstrong\u003emagnetite\u003c\/strong\u003e, purge air after refilling, add or replace \u003cstrong\u003einhibitor\u003c\/strong\u003e or \u003cstrong\u003ecleaner\u003c\/strong\u003e, or \u003cstrong\u003ewinterize\u003c\/strong\u003e a seasonal system. Because it is used so rarely, the original valve often seizes, weeps at the stem or fails to shut tightly after years of sitting; a drain valve that drips into a closed system also quietly feeds \u003cstrong\u003emake-up water\u003c\/strong\u003e and fresh oxygen into it, which accelerates \u003cstrong\u003ecorrosion\u003c\/strong\u003e. Confirm the \u003cstrong\u003e3\/4-inch NPT\u003c\/strong\u003e thread and the boiler model against \u003cstrong\u003e511-246-392\u003c\/strong\u003e before ordering.\u003c\/p\u003e\n\n\u003cp\u003eTo replace the valve, shut off the \u003cstrong\u003epower and fuel\u003c\/strong\u003e to the boiler and let the water cool completely, since hot boiler water can cause serious \u003cstrong\u003escalds\u003c\/strong\u003e. Relieve pressure, drain the boiler below the valve level, and unthread the old drain with a properly sized wrench. Clean the \u003cstrong\u003eboiler tapping\u003c\/strong\u003e, apply a \u003cstrong\u003epipe-thread sealant\u003c\/strong\u003e rated for heating water to the \u003cstrong\u003emale threads\u003c\/strong\u003e, and thread the new valve in snugly — do not overtighten brass into the cast tapping. Close the valve, refill and \u003cstrong\u003epurge the system\u003c\/strong\u003e, bring it up to pressure and check the \u003cstrong\u003evalve stem\u003c\/strong\u003e and \u003cstrong\u003ethread joint\u003c\/strong\u003e for weeping. A \u003cstrong\u003ehose cap\u003c\/strong\u003e or plug on the outlet is a good habit that stops slow drips and protects the outlet threads.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOEM Weil McLain Replacement:\u003c\/strong\u003e The factory-specified \u003cstrong\u003e3\/4-inch drain valve\u003c\/strong\u003e for select \u003cstrong\u003eWeil McLain\u003c\/strong\u003e boilers, so the thread and body fit the original \u003cstrong\u003etapping\u003c\/strong\u003e.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSolid Brass Body:\u003c\/strong\u003e \u003cstrong\u003eBrass\u003c\/strong\u003e construction resists corrosion in \u003cstrong\u003ehydronic\u003c\/strong\u003e water and holds up to repeated opening and closing.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHose-Ready Outlet:\u003c\/strong\u003e The \u003cstrong\u003eangled threaded outlet\u003c\/strong\u003e accepts a \u003cstrong\u003edrain hose\u003c\/strong\u003e for quick, controlled \u003cstrong\u003edraining\u003c\/strong\u003e and \u003cstrong\u003eflushing\u003c\/strong\u003e.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEasy-Turn Wheel Handle:\u003c\/strong\u003e The \u003cstrong\u003ewheel handle\u003c\/strong\u003e gives positive control when opening slowly, which helps keep the \u003cstrong\u003eflow\u003c\/strong\u003e steady and manageable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWhat size is this drain valve?\u003c\/strong\u003e The \u003cstrong\u003eWeil McLain 511-246-392\u003c\/strong\u003e has a \u003cstrong\u003e3\/4-inch NPT\u003c\/strong\u003e inlet connection.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWhat is it used for?\u003c\/strong\u003e \u003cstrong\u003eDraining\u003c\/strong\u003e, \u003cstrong\u003eflushing\u003c\/strong\u003e and \u003cstrong\u003eservicing\u003c\/strong\u003e a \u003cstrong\u003ehydronic heating system\u003c\/strong\u003e from the boiler's low point.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWhy replace a drain valve that still turns?\u003c\/strong\u003e A valve that \u003cstrong\u003eweeps\u003c\/strong\u003e or will not seal feeds \u003cstrong\u003efresh water and oxygen\u003c\/strong\u003e into a closed system, which speeds up \u003cstrong\u003ecorrosion\u003c\/strong\u003e; replacing it is inexpensive insurance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Weil McLain","offers":[{"title":"Default Title","offer_id":67659135582386,"sku":"511-246-392","price":26.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/511-246-392.jpg?v=1791482092","url":"https:\/\/www.gsistore.com\/products\/weil-mclain-511-246-392","provider":"GSIstore","version":"1.0","type":"link"}