The Maxon 38009 Adjustable Orifice Valve is a precision gas-flow control component designed to regulate fuel delivery in compatible commercial and industrial heating equipment. It works by allowing adjustment of the gas orifice opening to control the volume of fuel supplied to the burner, supporting proper combustion and heat output. Commonly used in gas-fired burners, furnaces, boile... https://www.partshnc.com/38009-maxon-375-npt-orifice