Pumps come with cast iron sleeve and enough CFM to power most tools used on construction sites. Efficient compact design. CFM at 90 PSI: 13.3, Max. PSI: 130, Flywheel Diameter (in.): 13, Stages: 1, Total Cylinders: 2, Required Power: 3 HP at 1,450 RPM , 4HP at 1,450 RPM (130 Max. PSI), Bore Diameter (in.): 2 3/8, Stroke Length (in.): 2 1...