Abstract: An oxygen delivery system provides supplemental oxygen on demand from an oxygen source to a human being via an oxygen mask. The system includes a regulator having an inlet and an outlet. The regulator is removably secured to the oxygen source. A release pin is disposed in the regulator for quickly actuating operation of the regulator. Prior to operation, the release pin maintains the regulator in a closed position so that the regulator prevents the flow of oxygen from the oxygen source. Upon removal of the release pin, the regulator assumes an open position so that it permits the flow of oxygen from the oxygen source, through the regulator, and to the human being. The system is rechargeable and may be carried on the person or stored at home for emergency use.