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NEW, nos, Diluter Demand Aircraft Pressure Breathing Oxygen Regulator. Type A-14. Manufactured by Alar products, Inc. P/N 3000. Stock number 5505-3000. Mil Spec MIL-R-6371. It has indefinite shelf life as indicated on attached tag although manufactured in the 50s. Regulator was in a sealed and preserved package until removed to take the photo. Used extensively on most 50s and 60s and even later warbird jets and also several civilian aircraft.