Vacuum pumps connect to systems for air or material removal such as filtration or packaging. These pumps generate vacuum, which creates suction. The type and size of vacuum pump needed is based on the level of vacuum required, the application in which it is operating, and the type of material it is vacuuming. Rotary vane vacuum pumps generate stronger vacuum and air volume than diaphragm or liquid ring vacuum pumps. Diaphragm vacuum pumps are used in applications where corrosive fumes may be present. Liquid ring vacuum pumps are used in applications that include small amounts of liquid.