The two types of the Travaini vacuum pumps we have are rotary vane single stage and liquid ring. The single stage rotary vane Travaini vacuum pumps are air-cooled and capable of producing an ultimate vacuum of .5 Torr. The pumps carry features of compact, simple design; quiet air-cooled operation; Direct Drive; built in oil mist eliminator; anti-suck back valve. These features result in easy installation and low maintenance; no water requirements; no belt or gears to wear or loosen; 99.9% oil free exhaust and high water vapor handling capabilities. With several models to choose from, you can’t go wrong with Travaini vacuum pumps.