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 2925-01-633-4048
NSN 5835-00-841-2650
NSN 5945-01-263-3789
NSN 6240-01-521-9781
NSN 5950-00-062-2244
NSN 7035-01-202-8172
NSN 5965-01-170-5705
NSN 5996-01-232-0067
NSN 6620-01-520-4186
NSN 5920-00-228-1807
NSN 5915-00-970-1419
NSN 6150-00-882-1022