Our 3.5CFM / 4CFM / 5CFM HVAC vacuum pump delivers fast evacuation, reaching an ultimate vacuum of 5 Pa. Our 6CFM / 9CFM HVAC vacuum pump delivers fast evacuation, reaching an ultimate vacuum of 0.2 Pa. Equipped with a pure copper motor, 1/4" SAE and 1/2" ACME ports-US Standards / 3/8"SAE & 1/4"SAE ports-EU Standards, and a bottle of 0.35 qt. vacuum oil, it easily repairs automotive or smaller-scale HVAC systems like R22, R134a, and R410a.