Direct-drive rotary vane vacuum pump, dual mode, 3.5 cfm, 115/220 VAC

Wide range of free-air capacities to match specific applications|Positive pressure oil system ensures proper lubrication and prevents oil starvation at high gas loads |Fast acting inlet valve protects internal components against oil and air contamination if the pump stops while under vacuum |Gas ballast valve limits internal condensationuse pump when condensable vapors are present|No need to purchase both single- and dual-stage pumps! Dual-mode pumps offer a choice of high-vacuum (HV) mode or high-throughput (HT) mode in one pump. Pumps also feature three-position gas ballast control. Set the pump to HV mode with gas ballast off for use with electron microscopes or mass spectrometers; set it to HT mode with gas ballast fully open for use with gel dryers, vacuum ovens, or rotary evaporators.|Power cord and plug are included with the pump.