Powermate 20 Gal. compressor features a cast iron, v-twin cylinder, oil lubricated pump. Includes a 1-piece cast iron crankcase, thermally stable cast iron cylinder body, aluminum head and machined cast iron valve plate, automotive style ball bearings, durable stainless steel reed valves, oil level sight glass, easily accessible oil fill and a 10 cast iron balanced flywheel. CFM at 40 psi is 6.2 and CFM at 90 psi is 5.3.