The air vacuum pump is a venturi-type AC pump that eliminates moisture 
from air conditioning systems, which makes it safe and easy to add refrigerant. The surroundings vacuum pump is simple to operate 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 via an orifice increases its velocity and lowers its air pressure. Ambient air is used through channels in the generator, creating suction and vacuum. The air stream exits through the exhaust. … These operations require vacuum pumps.