The air vacuum pump is a venturi-type AC pump that eliminates moisture from air conditioning 
systems, making it safe and easy to add refrigerant. The air vacuum pump is easy to function and pulls full vacuum within two minutes of being connected to an air collection. Includes 1/2 in. ACME (R134a) and R12 connectors.
Air-driven vacuum pumps work when compressed air moving through an orifice increases its velocity and lowers its air pressure. Ambient surroundings is used through channels in the generator, creating suction and vacuum. The air stream exits through the exhaust. … These procedures require vacuum pumps.