2A-24 : Two-Place Advanced Aviation Oxygen System 
Aluminum high pressure refillable cylinder 
680 liters/24 cu. ft. (4.38" diam x 24.9" - 7.14lbs.)
Standard 870 toggle valve
Adjustable 12 position regulator (0 to 15 LPM) with contents gauge and shutoff, all brass interior
2 Standard oxygen masks, 2 standard nasal cannulas
Cylinder duration at 10,000 ft: 3.7 hours w/standard mask @ 3 LPM
Using Oxymizers, duration increases up to 400%