The MD medical oxygen cylinder is a great choice for anyone who needs a very portable oxygen system with a significant oxygen supply. The MD cylinder can supply over 9 hours using the RESOURCE v.2 pneumatic conserving device or up to 39 hours using the SOLO2 pneumatic conserving device. This cylinder can be conveniently transported using the CD1003 shoulder bag, the CD10011 cylinder backpack, or the CART101-A cylinder cart. 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. Select your choice below.