Pressure Pump Lubrication Type Oil Free Number of Cylinders 2 Output Power 0.5 hp Phase Single Voltage 115-120V AC Maximum Continuous Pressure 30 psi Maximum Intermittent Pressure 30 psi Maximum Vacuum Not Applicable Free Air Flow Rate 4.8 cfm Maximum Speed 1 725 RPM Inlet Size 15 7/8 in Inlet Type NPT Inlet Gender Female Outlet Size 1/4 in Outlet Type NPT