Allied-31-10-0004 Aluminum D-Size Portable Medical Oxygen Cylinder 400 Liter (1 EA)Allied Medical LLC Aluminum 400 Liter Medical Oxygen Cylinder The Allied Medical 31 10 0004 is a lightweight aluminum D size cylinder designed for portable medical oxygen therapy. This 400 liter capacity tank is manufactured from high strength aluminum alloy, making it significantly easier to transport than traditional steel cylinders. It features a standard post valve for seamless integration with medical regulators and is an ideal solution for