... steel, engineering plastics 3: pressure gauge for oxygen canister OXYGEN PRESSURE GUAGEFeatures:Oxygen pressure gauges for measuring the pressure of oxygen medium, forbidden contacts ... 5'',50mm=2'', 60mm=2.5'',100mm=4'',150mm=6''. Otherwise,we can do special size you need. ... connection, Back connection or Back connection with border. 6.Thread:BSP,NPT,BS,UNand other special specification7.Temperature:- ...