... sealing components. It is an ideal instrument to calibrate pressure regulator , such as :oxygen acetylene, argon ,CO2, N2, H2 ,gauges, ... to disassemble the gauges .Users can install the whole regulator on the pump and calibrate them at the same time ... high sealing technology ,non-leakagelCan check the leakage of the regulator lWith quick coupling, convenient to connectlSeparated low and high pressure ...