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 5999-00-227-9458
NSN 5999-01-092-5941
NSN 5975-01-409-2948
NSN 6105-01-634-0322
NSN 6610-01-287-8559
NSN 6150-01-107-2271
NSN 5975-01-127-2072
NSN 5960-01-201-5804
NSN 5905-01-611-5383
NSN 6645-01-064-3711
NSN 6240-01-447-3779
NSN 5905-00-642-2036