The Harvest Pro® Laboratory RVD-2 Vacuum Pump (115 V, 60Hz, 1 Phase) is built to last. This rugged and reliable vacuum pump is designed for long life with continuous use. The Harvest Pro® RVD series of vacuum pumps are specifically suited for botanical extraction, like distillation, freeze drying and a number of other processing techniques. Easily control the ultimate pressure of this dual-stage rotary vane vacuum pump thanks to its adjustable gas ballast. A built-in backflow preventer helps avoid oil contamination in case of an unexpected shutdown. Plus, the low decibel rating (56-58) makes it one of the quietest rotary vane vacuum pump available. Displacement speed at 60Hz = 4.8 m3/h (2.8 cfm).