| The power lever on on, and, the 'o2' lever on normal allows the oxygen to enter the regulator And enables breathing of a mixture of air/oxygen according to altitude. |
| With the EMERGENCY lever on OFF, in an emergency situation, one cannot use the oxygen mask to breathe. |
| The 'O2' lever on ON enables breathing of the over-pressure oxygen at a constant flow rate. |
| The Emergency Lever On On Enables Breathing Of Pure Oxygen At Ambient Pressure. |
EN 