This is an This is an OEM Goodman/Amana/Janitrol Furnace LP Gas Valve Conversion Kit The Goodman part number is LPM-01A (also LPM-01). This conversion kit works for Janitrol/Goodman furnaces where the furnace model # starts wtih GMN GMPH or GPD. Thanks for looking and good luck!
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.