... oil, Use for freezer,refrigerator etc Vaccum pump Character:1,Double high-speed direct coupling ... ,Equipped with oil pump special structure device, forced to be automatic filling, in general the atmosphere also ... used as booster pump, and the diffusion pump, molecular pump, backing pump, maintain pump, titanium pump drainage pump use7,Used for vacuum ... 276×470 Vaccum ring Vaccum line Vaccum pump