vacuum air pump set is mainly used to draw out air in the container and make the container to attain high vacuity; simultaneity can dry equipment in vacuum. the vacuum air pump is provided with characteristics to startup fleetly, draw out greatly etc. and can be used i the fields of smelting in vacuum, welding, pharmacy and electrical vacuum equipment, especially suited to draw out the transformer. features of product 1. simple configuration and convenient in operation. 2. the fore pump adopts the original vacuum pump imported from europe, and customer would choose the imported roots pump or homemade ones according to their purchase capacity. the pumps have high pump speed so that attain high working vacuity. 3. equip in-line filter could keep large impurities out of equipment and prevent damaging the vacuum pump. 4. the standard model of plants is closed type so that using outside easily and have nice appearance.