{"product_id":"weil-mclain-511-246-305","title":"Weil McLain 511-246-305 Gas Valve","description":"\u003cp\u003eThe \u003cstrong\u003eWeil McLain 511-246-305 2-Inch Manual Main Shut-Off Gas Valve\u003c\/strong\u003e is the \u003cstrong\u003eOEM 2-inch NPT lever ball valve\u003c\/strong\u003e that sits at the front of the gas train on \u003cstrong\u003eWeil-McLain LGB commercial gas boilers\u003c\/strong\u003e. It is a \u003cstrong\u003ebrass valve\u003c\/strong\u003e with \u003cstrong\u003e2-inch female NPT connections\u003c\/strong\u003e on both ends, a \u003cstrong\u003eyellow lever handle\u003c\/strong\u003e, and a \u003cstrong\u003e1\/8-inch NPT downstream pressure tapping\u003c\/strong\u003e on the body, closed with a \u003cstrong\u003ebrass plug\u003c\/strong\u003e, so a \u003cstrong\u003emanometer\u003c\/strong\u003e can be connected right at the valve. In Weil-McLain’s \u003cstrong\u003eLGB-6 through LGB-20 CSD-1 control supplement\u003c\/strong\u003e, the parts list names \u003cstrong\u003e511-246-305\u003c\/strong\u003e as the \u003cstrong\u003emanual main shut-off valve\u003c\/strong\u003e and shows it as a \u003cstrong\u003e2-inch Conbraco 50-703\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIn that supplement, gas enters the boiler through a \u003cstrong\u003edrip leg\u003c\/strong\u003e and reaches the \u003cstrong\u003emanual main shut-off valve\u003c\/strong\u003e immediately after the drip leg. Weil-McLain calls for \u003cstrong\u003einlet pressure at this valve of at least 7 inches W.C.\u003c\/strong\u003e (5 inches W.C. on special order) \u003cstrong\u003eand no more than 13 inches W.C.\u003c\/strong\u003e; if supply pressure can exceed \u003cstrong\u003e13 inches W.C.\u003c\/strong\u003e, a \u003cstrong\u003e100% lock-up regulator\u003c\/strong\u003e goes \u003cstrong\u003eupstream of the hand valve\u003c\/strong\u003e. The same manual has you \u003cstrong\u003eclose the valve during pressure tests below 13 inches W.C.\u003c\/strong\u003e, and above that level the boiler and gas valve are \u003cstrong\u003edisconnected from the supply\u003c\/strong\u003e entirely. The \u003cstrong\u003elever\u003c\/strong\u003e makes the position obvious: \u003cstrong\u003ein line with the pipe is open\u003c\/strong\u003e, \u003cstrong\u003eacross the pipe is closed\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eReplace the valve when the \u003cstrong\u003ehandle is seized or will not turn a full quarter turn\u003c\/strong\u003e, when it \u003cstrong\u003eweeps at the stem\u003c\/strong\u003e, or when it \u003cstrong\u003ewill not hold a bubble-tight shutoff\u003c\/strong\u003e in a leak check. With the gas supply isolated upstream and the line made safe, remove the old valve, clean the pipe threads, apply \u003cstrong\u003egas-rated thread sealant\u003c\/strong\u003e, and install the new \u003cstrong\u003e511-246-305\u003c\/strong\u003e with the \u003cstrong\u003epressure tapping on the downstream side\u003c\/strong\u003e. Then restore gas, \u003cstrong\u003eleak-test every joint\u003c\/strong\u003e with approved solution, and relight the boiler by the \u003cstrong\u003eCSD-1 operating instructions\u003c\/strong\u003e. Gas work belongs to a \u003cstrong\u003equalified technician\u003c\/strong\u003e following local code.\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 Gas Train Isolation:\u003c\/strong\u003e The \u003cstrong\u003efactory 2-inch manual main shut-off\u003c\/strong\u003e for the \u003cstrong\u003eLGB series\u003c\/strong\u003e, positioned exactly where Weil-McLain’s \u003cstrong\u003epiping and CSD-1 instructions\u003c\/strong\u003e expect it.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBuilt-In Test Port:\u003c\/strong\u003e The \u003cstrong\u003e1\/8-inch NPT pressure tapping\u003c\/strong\u003e lets you read \u003cstrong\u003egas pressure\u003c\/strong\u003e at the valve for \u003cstrong\u003estartup, leak testing, and troubleshooting\u003c\/strong\u003e.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePositive Quarter-Turn Shutoff:\u003c\/strong\u003e A \u003cstrong\u003elever ball valve\u003c\/strong\u003e shows \u003cstrong\u003eopen or closed at a glance\u003c\/strong\u003e and shuts off \u003cstrong\u003efully in a quarter turn\u003c\/strong\u003e.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eClean Drop-In Swap:\u003c\/strong\u003e \u003cstrong\u003e2-inch NPT female\u003c\/strong\u003e ends match the original \u003cstrong\u003e2-inch gas inlet piping\u003c\/strong\u003e, so there is no re-piping.\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 boilers use it?\u003c\/strong\u003e Weil-McLain lists \u003cstrong\u003e511-246-305\u003c\/strong\u003e as the \u003cstrong\u003e2-inch manual main shut-off valve\u003c\/strong\u003e in the \u003cstrong\u003eLGB-6 through LGB-20 CSD-1 control supplement\u003c\/strong\u003e. Match by boiler model, size, and serial number, since inlet pipe size varies across the \u003cstrong\u003eLGB\u003c\/strong\u003e line.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWhat is the small plugged port on the body?\u003c\/strong\u003e It is a \u003cstrong\u003e1\/8-inch NPT downstream pressure tapping\u003c\/strong\u003e for a \u003cstrong\u003emanometer\u003c\/strong\u003e or gauge; keep the \u003cstrong\u003eplug\u003c\/strong\u003e installed and sealed when you are not testing.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCan I use a regular 2-inch ball valve instead?\u003c\/strong\u003e A boiler gas train should use a \u003cstrong\u003egas-rated manual shut-off valve\u003c\/strong\u003e specified for the application. The \u003cstrong\u003e511-246-305\u003c\/strong\u003e is the factory-listed part, so the boiler’s original \u003cstrong\u003egas train design\u003c\/strong\u003e stays intact.\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":67741629644978,"sku":"511-246-305","price":288.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/511-246-305.jpg?v=1792268651","url":"https:\/\/www.gsistore.com\/en-ca\/products\/weil-mclain-511-246-305","provider":"GSIstore","version":"1.0","type":"link"}