Pumps come with cast iron sleeve and enough CFM to power most tools used on construction sites. Efficient compact design. CFM at Max PSI: 18.1, CFM at 90 PSI: 15.9, Max. PSI: 175, HP: 5, Flywheel Diameter (in.): 13.8, Stages: 2, Total Cylinders: 2, Required Power: Requires 5 HP electric motor or 9 HP gas engine, Bore Diameter (in.): 3.74,...