AIR COMPRESSOR PUMP, LUBRICATION TYPE PRESSURE LUBRICATED, NUMBER OF STAGES 2, MAXIMUM OUTPUT POWER 7.5 HP, FREE AIR FLOW RATE @ MAXIMUM PRESSURE 17.3/23.5 CFM @ 175 PSI, NUMBER OF CYLINDERS 2, MAXIMUM OPERATING PRESSURE 175 PSI, FLYWHEEL DIAMETER 16 1/2 IN, FLYWHEEL INCLUDED YES, PUMP SPEED 1,035 RPM, CONSTRUCTION CAST IRON, GROOVE SECTION B, NUMBER OF GROOVES 2, VALVE TYPE DISC, VALVE MATERIAL SWEDISH STEEL, ROTATION CCW, STROKE LENGTH 3 IN