American Made 5" Air Line Style Throttle Control Made For Honda Gas Air Compressor Engines. For Use With 5.5 - 6.5 HP Honda Engines, GX160 & GX200. 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 Honda engines 6.5 HP or smaller. This is mounted next to the throttle control on the engine and an air line is used from the pilot valve to control the engine speed. Control Rod Length: 2 1/4". Overall Length 5". Valve Thread Size: 1/4" Compression.