Robinair (15500) VacuMaster Economy Vacuum Pump - 2-Stage, 5 CFM Robinair's VacuMaster Economy Vacuum Pump is designed for air conditioning and refrigeration service; featuring a 2-stage rotary vane design, 7.5 ounce oil capacity, and non-skid feet 5 CFM free air displacement; factory rated to 35 microns 1/3 HP, 115V/60 Hz thermally protected motor Features an inlet fitting engineered for maximum airflow, while preventing oil backflow, and finned aluminum surfaces that dissipate heat faster, keeping the pump cooler and extending life 1/4 inch MFL & 3/8 inch ACME inlet fittings, 3/8 inch FFL x 1/2 inch Acme adapter, easy to read sight glass, easy access oil fill port, and angled oil drain valve for faster, more complete draining