The Chicago Pneumatic CPS 400 is a gear driven oil-injected rotary screw type air compressors, powered by a water-cooled, Cummins diesel engine. The unit consists of an element, diesel engine, cooling, air/oil separation and control systems - all enclosed within a sound dampened strong canopy. Special attention has been given to the overall product quality, user friendliness, ease of serviceability, and economical operation to ensure best in class cost of ownership.