The Lochinvar & A.O. Smith 100171985 Gas Valve Assembly is an OEM replacement component designed for compatible Lochinvar SNR/A 126 gas-fired water heaters and boiler systems. It regulates the flow and pressure of natural gas or propane supplied to the burner, supporting controlled combustion and efficient heat generation. This assembly helps maintain consistent heating performance, r... https://www.partshnc.com/100171985-lochinvar-ao-smith-gas-valve-assembly