Description:Cat® Compressor Group provides the system with pressure and consists of an electromotor that drives the cylinder piston via a connecting rod. It's switched on and off by a relay controlled by the ECU. The air that is sucked in is compressed by the movement of the piston.Application:Cat® Compressor used to circulate air for the seat suspension system in Cat machines. Consult your owner's manual or contact your local Cat Dealer for more information.