Piston Air Compressor/Vacuum Pump Lubrication Type Oil Free Number of Cylinders 2 Output Power 0.333 hp Phase Single Voltage 115V AC Maximum Vacuum 29 in Hg Free Air Flow Rate 1.6 cfm Maximum Speed 1 750 RPM Inlet Size 1/4 in Inlet Type NPT Outlet Size 1/4 in Outlet Type NPT