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Rotary Piston Vacuum Pump piston pumps are used for most large level vacuum applications. These pumps possess a sliding sleeve through which the gas enters, after that drawn into a cylindrical chamber and exhausted by a rocking piston plunger. These pumps are very hardy and have pumping speeds that range from 15 cfm to 2,000 cfm and the pumps can reach a pressure of just one 1 x 10-4 Torr. Rotary piston pumps could be ready for corrosive and oxygen services.