Dry Vacuum Pump CR series is an air-cooled roots type dry vacuum pump. Stable operation and extended lifetime are possible because there is no oil inside of the pump head and no contact between rotor and cylinder. Air cooled for low running costs. • No requiement for cooling water and nitrogen gas. • Low power consumption, air tight and light weight are featured in this pump. • Possible to pump down water vapor by use of gas ballast. • Integrated silencer results in a compact design.