A-9 : Two-Place Advanced Aviation Oxygen System 
Aluminum high pressure refillable cylinder 
255 liters/9 cu. ft. (4.38" diam x 10.7" - 3.6 lbs.)
Standard CGA-870 toggle valve
Adjustable 12 position regulator (0 to 15 LPM) with contents gauge, all brass interior, barbed outlet, pin indexed
2 Standard oxygen masks, 2 standard nasal cannulas
Cylinder duration at 10,000 ft: 1.4 hours w/standard mask @ 3 lpm
Using Oxymizers, duration increases up to 75%