The Lochinvar & A.O. Smith 100211941 1/2 Inch Inlet Gas Valve is a genuine replacement component designed to regulate the flow of natural or LP gas in compatible residential and light commercial gas-fired water heaters, boilers, and heating equipment. It works by opening and closing the gas supply in response to the appliance's control system, ensuring safe and efficient burner operat... https://www.partshnc.com/12inlet-gas-valve-3