Direct-drive, two-stage, rotary-sliding, vane-high vacuum pump. Gas ballast and trap reduces risk of oil being sucked into the system. Pump produces free air displacement 85 L per minute (3 cu. ft. per minute) and maximum vacuum 29–30". Operating temperatures range 30–170 degreesº F (-1.11–76.6º C) .25" O.D. intake ports for .25" I.D. tubing.