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This vacuum pump is made of PCE and weighs approx. 140 grams. The pump sucks 15mL of air per pump, and it can create a negative pressure corresponding to approx. 50 mbar. The scale of the vacuum gauge shows vacuum down to -1 bar (-0.1MPa). An air valve for equalizing pressure (small plastic cap) at the top of the pump and an elastic valve make it possible to equalize the pressure quickly. A hose with a diameter of ø 6/8mm and a length of 400mm is included.