MD Medical Oxygen Cylinder Flow Rate 0 to 25 Lpm Capacity 398 L Material Aluminum Length 4 13/32 in Width 4 13/32 in Height 16 1/2 in For Use With GO2 PRO Bags OMNI PRO Bags  M.U.L.E. Bags Cylinder Refillable Number of Settings 0 Includes Z Valve