Pumps come with cast iron sleeve and enough CFM to power most tools used on construction sites. Efficient compact design. Requires 3 HP electric motor or 5 HP gas engine.CFM displacement - 11.38.2 CFM @ 90 PSIMaximum PSI - 130 PSISingle stageTwo cylinderCast iron sleevePump rotates CCW as viewed from the flywheelUses one A groove beltOil sight glass11in. diameter flywheel/fan