Vietnam type oxygen regulator
Give oxygen for first-aid or oxygen uptake for the people who are lace of oxygen. 

How to use

1.      Open the valve of oxygen cylinder after connect the screw nut of air intake closely

2.      Connect the oxygen pipe to the oxygen outlet firmly

3.      Demount the humidifying cup(anticlockwise rotation), put some distilled water in (purified water or plain boiled water can also take place), the water quantity should be between the bottom and top tick mark, then tighten up the bottle cap to the humidifying cup(clockwise rotation)

4.      Rotate the flow regulating valve to the rate you need (anticlockwise to up, clockwise to down, till to close), then put it to nose to use.

5.      Close the valve of oxygen cylinder firstly while not using, then close the flow regulating valve until the pointer of oxygen manometer return to zero.