Air Compressor Pump Lubrication Type Pressure Lubricated Number of Stages 2 Maximum Output Power 15 hp Free Air Flow Rate @ Maximum Pressure 53.7 cfm @ 175 psi Number of Cylinders 2 Maximum Operating Pressure 175 psi Flywheel Diameter 22 in Flywheel Included Yes Pump Speed 770 RPM Construction Cast Iron Groove Section B Number of Grooves 3 Valve Type Disc Valve Material Swedish Steel Rotation CCW Stroke Length 4 1/2 in