Air Compressor Pump, Lubrication Type Splash Lubricated, Number of Stages 2, Maximum Output Power 5 hp, Free Air Flow Rate @ Maximum Pressure 9.7/16.5 cfm @ 175 psi, Number of Cylinders 2, Maximum Operating Pressure 175 psi, Flywheel Diameter 16 1/2 in, Flywheel Included Yes, Pump Speed 710 RPM, Construction Cast Iron, Groove Section B, Number of Grooves 2, Valve Type Disc, Valve Material Swedish Steel, Rotation CCW, Stroke Length 3 in WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)