Uniweld HVP12 Pump, Vacuum Pump, Rotary Vane, 12.0 CFM, 115/220VAC, 2 Stage Duty cycle: intermittent Gas ballast: yes Port size: inlet:1/4" x 3/8" flare and 1/2" male acme (auto); outlet: filter Power (amps): 5.4 Power (hz): 50/60