... vacuum pump/diaphragm pump/oilless pump no oil, portable, low noise, high pressure, CE approval, OEM accepted,Patent protected vacuum pump/diaphragm pump/oilless pump ... Co.,Ltd. Jinteng GM-0.50 diaphragm vacuum pump has features of more advanced design, higher efficiency, longer operating ... It is can be in service under the condition of no working medium (no oil) and will not produce any pollution. ...