The CPS Products VP4S Pro-Set 4 CFM Vacuum Pump, 1 Stage, Dual Voltage (110-120V/220V) 50/60Hz is a 4 CFM, single stage unit with a versatile dual voltage 1/3HP motor. The unit boasts the same high quality, high value features engineered into all Pro-Set® Premium Series vacuum pumps providing performance excellence and years of reliable service.