This aluminum refillable oxygen cylinder features a CGA-870 toggle valve. 
Used for portable or emergency oxygen and for backup oxygen supply for a home oxygen generating system.  Provides 680 minutes of oxygen at 1 LPM.

Specifications:
CAPACITY:    680 liters
DIAMETER:     4.38"
LENGTH:        28.9"
WEIGHT:       8.4 lbs
VOLUME:      24 cu.ft.  (2015 psi)