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 5910-00-292-0048
NSN 5895-01-153-2249
NSN 6610-01-581-6689
NSN 5990-01-264-3320
NSN 6150-00-780-7747
NSN 5975-01-538-2936
NSN 7035-01-412-8322
NSN 6220-00-250-6900
NSN 6150-01-467-2504
NSN 6320-00-894-1644
NSN 5985-01-470-4394
NSN 5945-01-225-6134