Air Compressor Pump Lubrication Type Pressure Lubricated Number of Stages 2 Maximum Output Power 15 hp Free Air Flow Rate @ Maximum Pressure 34.8/49.0 cfm @ 175 psi Number of Cylinders 4 Maximum Operating Pressure 175 psi Flywheel Diameter 19 in Flywheel Included Yes Pump Speed 1 045 RPM Construction Cast Iron Groove Section B Number of Grooves 2 Valve Type Disc Valve Material Swedish Steel Rotation CCW Stroke Length 3 in