Piston Air Compressor/Vacuum Pump, 1 hp HP, Voltage 115V AC, 60 Hz, 1 Phase, Full Load Amps 8.5, Inlet Size 1/4 in NPT, Outlet Size 1/4 in NPT, Max. PSI Cont./Int. 50/120, Free Air CFM @ 50 PSI 4.65, 25 in Hg Max. Vacuum, Free Air CFM @ 20 In. Hg 0.88, Overall Length 15 3/4 in, Overall Width 7 1/4 in, Overall Height 10 1/16 in, Cylinder Material Aluminum, Number of Cylinders 2, Motor Type Shaded Pole, Thermally Protected with High Torque Start Winding, 1750 RPM, 63 dBA @ 60 psi Sound Rating