Compact design, ready to use, no set-up required. Constructed in highly chemical resistant materials. Quiet operation. 100% oil-free pumping of gases. Gas ballast as standard for working with condensable vapours. Good ultimate vacuum even with gas ballast. High vapour tolerance for water and solvents. Long service life, low maintenance. PC 511 NT(two-stage): with AK + EK; 1 electronically controlled and 1 manually controlled vacuum port. Characteristics and applications: With vacuum control: PC 511 NT: Well-proven units for a wide range of processes in chemistry laboratories, e.g. all classical low-boiling-point solvents. 7 / 12mbar ultimate vacuum. The PC 511 NT has an additional, manually controlled, vacuum port.