Pfeiffer Duo 3

This is a used Pfeiffer Duo 3 two-stage rotary vane vacuum pump, a compact and reliable pump designed for rough and medium vacuum applications in laboratory settings. Pfeiffer's Duo series is well regarded for its quiet operation, oil-sealed vane design, and consistent pump-down performance across a range of small to medium vacuum chambers. The Duo 3 in particular is sized for bench top and small system use where dependable vacuum is needed without a large footprint. This pump is often used to back turbomolecular pumps in mass spectrometers and analytical instruments, as well as to support general laboratory vacuum needs such as vacuum ovens, filtration setups, and degassing processes. Its two-stage rotary vane design provides good ultimate vacuum for its size, and its compact housing makes it easy to integrate into space limited lab benches or equipment racks. Having come from active laboratory use, this unit shows wear consistent with normal service life. Sold as used equipment, the Pfeiffer Duo 3 is a good option for labs and technicians looking for an affordable, proven backing pump. Buyers should plan to check oil levels, inspect for leaks, and test pump-down performance before placing the unit into regular use.