Low-maintenance, economical, single-stage vacuum pump is fast and easy to operate. Oil-less operation produces a moderate vacuum of 150 mm Hg (⅕ normal pressure). It can also push a pressure of 3,192 mm Hg, which is 4.2 times normal room pressure. Other specifications include 31 liters/min. open flow, motor speed of 1725 rpm, hp, gauges, on/off switch on cord, carrying handle, rubber feet, 115 V, 60 Hz, 15 lbs. net weight. Accepts ¼" i.d. tubing. Note: For the classic Boil Water in a Bell Jar experiment, we recommend using the Two-Stage Vacuum Pump, Catalog No. AP1597.