Replacement Pilot Unloader Valve for Champion VP1089041, P09329A , PO9329A. Pilot valves operate in a set pressure range. The range has an unload setting and a load setting. As a compressor operates in this range, it is said to by cycling. At the unload setting, the pilot valve opens and actuates another device (throttle control, discharge valve). At the load setting, the pilot valve closes and returns the compressor to normal operation. Need A Throttle Control Cable??? Visit our store for numerous sizes and ratings on throttle control cables. we do combine shipping on all of our products