... retrieving, filling, filtration, vacuumzing, storing and controlling systems.2. The device has the merits of good design, rust and shock proof ... .I. Piping systemWell designed in a vertical or horizontal way, with all connecting joints reliably fastened, well sealed to ... compressor, bumper, separator, filter, heat exchanger, safety valve, one-way valve, gas pressure gauge, vacuum gauge, and freezer;L. ...