It is designed as a direct replacment for the old part #s listed below. It is a fast opening gas valve with a 1/2" inlet and a 1/2" outlet. Thanks for looking and good luck! Function: The gas valve is a low voltage control (usually 24 VAC) that allow gas into the combustion chamber. It is also an adjustable regulator that insures proper gas pressure for combustion. They have a manual shut off. Replaces Old Part #s: Sta0151F00000PS 0151F00000P