Yescom Air Conditioning Refrigerant Vacuum Pump 3CFM 1/4HP Single-Stage Rotary R410a R134a HVAC AC System Tool 110V 3CFM 1/4HP single-stage rotary vane vacuum pump, comes with a bottle of vacuum oil, applicable for air conditioning(including automotive applications) High efficiency and low noise, manual shut off valve to prevent the oil in the vacuum pump backflow into the refrigerant tool 300ml oil capacity, can monitor oil level through oil sight glass With oil drain plug positioned at bottom of oil reservoir Exhaust port with exhaust cap