A item specifically designed to automatically/manually maintain outlet pressure in a divers helmet/breathing apparatus. It is designed for use with breathing gasses.
NSN 6130-01-629-9361
NSN 5999-01-518-2949
NSN 6685-01-264-7617
NSN 6240-01-121-8116
NSN 6130-01-214-9934
NSN 5990-00-373-9787
NSN 5985-00-868-2382
NSN 5965-01-652-3339
NSN 5996-01-633-7979
NSN 6240-00-841-0189
NSN 5975-00-954-3098
NSN 5905-00-104-7235