Passenger oxygen mask and breathing bag for an oxygen mask

An aircraft passenger oxygen mask, comprising:

• a polyurethane breathing bag having an oxygen inlet and an oxygen outlet;
• a polyurethane spiral oxygen feed tube;
• a mask;
• and
• a hollow, frusto-conical connection piece attached to an exterior surface of the polyurethane breathing bag at the oxygen inlet and coupling the polyurethane spiral oxygen feed tube to an interior of the polyurethane breathing bag, the hollow, frusto-conical connection piece includes a channel having a flow indicator therein extending substantially from the polyurethane spiral oxygen feed tube to the polyurethane breathing bag and disposed external to the polyurethane breathing bag, an annular peripheral groove into which a sealing disk resides, the annular peripheral groove extending radially inward from a portion of the frusto-conical connection piece having an outer wall radius greater than an inner tube radius of the polyurethane spiral oxygen feed tube, the flow indicator extending through the portion of the frusto-conical connection piece, the frusto-conical connection piece spaces the polyurethane spiral oxygen feed tube from the portion of the frusto-conical connection piece and the polyurethane breathing bag, the sealing disk having an inner radius, a first circumferential shoulder disposed substantially within an outer surface of the frusto-conical connection piece for receiving an annular locking ring, the first circumferential shoulder defining an outer shoulder radius less than the outer wall radius of the portion of the frusto-conical connection piece, and a radially projecting surface for receiving a sealed surface of the breathing bag.