Features: Shock absorbing rubber rings are used to buffer vibration during vacuum pump operation. All aluminum alloy body, high temperature resistance, has a long service life. Large oil mirror window is easy to observe and prevents the oil shortage. The vents can dissipate heat quickly, work stably for a long time, and increase the service life. The pure copper connector of the inlet port is 1/4 inch. It is guaranteed to start normally at low temperatures in winter. Can be widely used in refrigeration maintenance, automotive industry, automatic control, printing machinery, packaging machinery, food preservation, environmental detection systems, oxygen production in the plateau, etc.