Replacement American Made Brass Air Syle Throttle Control for Kohler CH440 Model HGR7-3K 14 HP Gas Air Compressor. For Use With Kohler Engines. This valve controls the engine throttle speed on gas powered air compressors when used in conjunction with a pilot / unloader valve. This is the standard size valve that controls Kohler engines 14 HP. This is mounted next to the throttle arm on the engine and an air line is used from the pilot valve to control the engine speed. Valve Thread Size: 1/4" compression For Use With Kolher Engines Up To 14 Horsepower.