Air Compressor Pump, Lubrication Type Splash Lubricated, Number of Stages 1, Maximum Output Power 5 hp, Free Air Flow Rate @ Maximum Pressure 16.5 cfm @ 140 psi, Number of Cylinders 4, Maximum Operating Pressure 140 psi, Flywheel Diameter 14 1/2 in, Flywheel Included Yes, Construction Cast Iron, Groove Section A/B, Number of Grooves 1, Valve Type Reed, Valve Material Stainless Steel, Rotation CCW, Stroke Length 2 in