... pumps Prevent return oil, Use for freezer,refrigerator etc Vaccum pump Character:1,Double high-speed direct coupling structure vane vacuum ... also can be used as booster pump, and the diffusion pump, molecular pump, backing pump, maintain pump, titanium pump drainage pump use7,Used for vacuum device manufacturing ... .580706×236×3902XZ-25B6×10-225Φ50394786×276×470 Vaccum ring Vaccum line Vaccum pump