With the Duo 125 and Duo 255, Pfeiffer Vacuum has brought to market two further two-stage rotary vane pumps featuring high pumping speeds of between 120 and 250 m3/h in the low and medium vacuum ranges. These pumps are suitable for use in high-vacuum pumping stations, in combination with turbo-pumps or as backing pumps for Roots pumps. The Duo 125 and Duo 255 complement the DuoLine series of rotary vane pumps, which offer compactness, high pumping speeds and low noise levels. These pumps are tolerant of dusty, dirty environments and corrosive gases. The integral pressurised oil lubrication system improves oil circulation and cooling, ensuring long service life. An hydraulic safety valve also ensures a high level of operating reliability. A range of accessories is available to broaden the applications potential of these pumps.