Dinglab,Stainless Steel Aspirator Pump,Humboldt,Lab Vacuum Hydro Aspirators Filter Pumps This aspirator pump made From Stainless Steel. This aspirator pump will perform under both high and low water pressure conditions. The pump features a ball-type positive action valve in the suction tube which will prevent water backflow if the pressure is reduced. Total length 98mm Watewr inlet OD 16mm Watewr outlet OD 10mm Vacuum OD 10mm Pumping rate: 1.5L/Min Max Vacuum：420mmhg Rubber O-ring with super glue for seal.Dont open this pump