This pump has special structure to keep from the lubricating oil go into container Specifications 1,2X Series Two-stage Rotary Vacuum Pump2 ... .0*0.01Pa4,Power:0.37-5.5KWDetails :2X Series Two-stage Rotary Vacuum Pump1,Technical Parameter:Speed of exhaust:2 ... iron2,Production Overview:The main parts of the vacuum pump by vacuum pump body , rotor, rotary piece, end cover and spring etc ...