... cystosepiment: 2 Thick cardboard: Rotary Vane Vacuum Pump is suitable for refrigeration, electronic light bulb industry, printing, pharmacy, foodpackaging, ... the container, get the air out make it for vacuum, inparticular for refrigeration repair(refrigerant such as R12/R22/R134a, ... . Main Features:1. Anti oil return designThe intake channel is for the special design, it can prevent the oil reflux ...