Robinair (15115) VacuMaster Single Stage Vacuum Pump - Single-Stage, 1.5 CFM Robinair's VacuMaster Single-Stage Vacuum Pump is designed for air conditioning and refrigeration service; featuring a single stage rotary vane design, 10 ounce oil capacity, and non-skid feet 1.5 CFM free air displacement; factory rated to 115 microns 1/5 HP thermally protected motor; 110V, 60 Hz 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 flare and 1/2 inch ACME inlet fittings, easy to read sight glass, easy access oil fill port, and angled oil drain valve for faster, more complete draining of the reservoir