Nalgene™ Hand Operated Vacuum Pumps with Gauge are ideal for siphoning, filtration, liquid transfer, bleeding fluid lines, and checking for leaks. Pumps are available with lightweight PVC or durable Zinc/Aluminum construction and can be disassembled for repair or replacement of internal parts. Pumps easily and quickly attain and hold vacuum of 25" (635mm) Hg. The vacuum trigger release requires only one hand to operate and releases vacuum with the touch of an index finger. With adjustable vacuum release rate. The small size has pumping rate of 15 cc/stroke and 7 psig (.48 bar) positive pressure at the exhaust port. Large size has rate of 36 cc/stroke and 12 psig (.84 bar) positive pressure at the exhaust port. Gauge monitors vacuum in kPa and inches of mercury. Full blank port pressure is obtained with only two strokes. Removable cover on exhaust port and trigger to release vacuum without disconnecting pumps from the line. Nozzle fits standard 1/4" I.D. tubing. Supplied with two ft. length of Nalgene™ 180 Clear Plastic Tubing.