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Piston pumps are used for most large level vacuum Rotary Piston Vacuum Pump applications. These pumps have got a sliding sleeve through which the gas enters, then drawn right into a cylindrical chamber and exhausted by a rocking piston plunger. These pumps are extremely hardy and also have pumping speeds that range between 15 cfm to 2,000 cfm and the pumps can reach a pressure of 1 1 x 10-4 Torr. Rotary piston pumps can be ready for corrosive and oxygen assistance.