The BASO Gas Products H91MA-4C REVB 1-Inch Automatic Gas Shutoff Valve is a safety component designed to control gas supply in compatible commercial and industrial heating equipment. It operates by automatically opening or closing the gas flow in response to signals from the connected control system, helping regulate fuel delivery to the burner. Commonly used in compatible boilers, fu... https://www.partshnc.com/h91ma-4c-revb-baso-gas-products-1-120v-12gas-vlv-505000btuh