... cardboard: Rotary Vane Vacuum Pump is suitable for refrigeration, electronic light bulb industry, printing, pharmacy, foodpackaging, medical, chemical equipment ... equipments.2. It has the advantages of small size, light weight, low noise, convenient for using and more.3 ... device at the exhaust port, withoutfuel injection and reduce oil mist pollution.3. Aluminum alloy motor casingMotor uses aluminum ...