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