Pumps come with cast iron sleeve and enough CFM to power most tools used on construction sites. Efficient compact design. CFM at 90 PSI: 15.9, Max. PSI: 175, Flywheel Diameter (in.): 13.8, Stages: 2, Total Cylinders: 2, Required Power: 5 HP Electric Motor or 9 HP Gas Engine, Bore Diameter (in.): 3 3/4, Stroke Length (in.): 2, Dimensions L...