The popular M6 medical oxygen cylinder is the perfect balance between portability and oxygen supply duration. The M6 cylinder is less than 15 inches in length and weighs only 3 pounds. Using the Resource v.2 pneumatic conserving device this cylinder can supply up to 10 hours of oxygen or just under 16 hours using the Solo2 pneumatic conserving device. This cylinder can also be conveniently transported using the CD1005 backpack, the CD1002 shoulder bag, the CD1008 fanny bag, or the CD1009 horizontal bag. This cylinder comes standard with a CGA870 medical post valve but can be fitted with a toggle valve, a "Z" valve, a handtight valve, a handtight and gauge valve, or a CGA540 valve.MUK870M6T