Abstract: An oxygen dispenser for dispensing substantially pure oxygen or highly oxygen enriched air. The dispenser has an oxygen concentrator or an oxygen/oxygen-enriched air-containing cylinder in fluid communicatin with a dispenser outlet via pipework, a flow control valve to control flow of oxygen or oxygen-enriched air to the dispenser outlet, the flow control valve being under the control of a controller. The dispenser unit further having a card reader for a mag-stripe, swipe card, smart card or similar or a receiver for credit tokens or other data credit input mechanisms whereby credit units may be input to the dispenser controller to dispense oxygen or oxygen enriched air.