Pumps come with cast iron sleeve and enough CFM to power most tools used on construction sites. Efficient compact design. Requires a 7.5 HP electric motor or a 13 HP gas engine.CFM displacement - 29.726.2 CFM @ 90 PSIMaximum PSI - 175 PSIRated for 7.5 HP at 1300 RPMBore - 4.33 X 2.36in., Stroke - 2.36in.Two stageTwo cylinderCast iron cylinderPump rotates CCW as viewed from the flywheelUses two A groove beltOil sight glass16.8in. diameter flywheel/fan