Abstract: An apparatus for providing oxygen-enriched air at a first pressure and at a second pressure, the second pressure being greater than the first pressure. The apparatus comprises, in combination, a pressure swing adsorption system and a pressure intensifier. The pressure swing adsorption system for enriching the oxygen content of air has a pressure of at least the first pressure. The pressure swing adsorption system is adapted to provide oxygen-enriched air to a first outlet at the first pressure and to provide oxygen-enriched air to a pressure intensifier at the first pressure. The pressure intensifier pressurises the oxygen-enriched air and provides the oxygen-enriched air to a second outlet at the second pressure.

Abstract: A high pressure fitting for filling a cylinder with a pressurized gas. The fitting comprises a fill port adaptor in combination with a flow controller system. The fill port adaptor has a movable injection port, a cradle and a locking clamp. The flow controller system has an inlet cooperatively adapted to receive the movable injection port. The flow controller and the fill port adaptor are open for flow of gas when the injection port is received in the inlet and closed for flow of gas when not so received. The locking clamp is adapted to lock the flow controller system in said cradle.