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 atmosphere vacuum pump is easy to function and 
pulls complete vacuum within two moments of being linked to an air series. Includes 1/2 in. ACME (R134a) and R12 connectors.
Air-driven vacuum pumps work when compressed air passing via 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 air flow stream exits through the exhaust. … These operations require vacuum pumps.