1. Draeger BG-4 Self Contained Breathing Apparatus
Procedures for Getting Under Oxygen:

2. Procedures for Getting Under Oxygen:
Put on facepiece properly and tighten straps
Open cylinder valve fully, then close one-half turn
Observe the monitron or sentinel pressure gauge and warning module:
Green indicator light - apparatus O.K
Red indicator light - apparatus faulty
PSI reading

3. Procedures for Getting Under Oxygen:
Tightly squeeze both breathing hoses and breathe in until a vacuum is produced.
Hold your breath for an instant;
The vacuum must be maintained, otherwise the straps on the mask must be tightened.

4. Procedures for Getting Under Oxygen:
Check gauge and operation, straps, etc., prior to leaving fresh-air base.