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 6105-00-307-3690
NSN 5985-01-334-7732
NSN 5996-01-151-8720
NSN 5950-01-156-5731
NSN 7035-01-364-0286
NSN 5945-01-068-3503
NSN 5950-00-781-3350
NSN 6650-01-060-3262
NSN 5950-00-062-0245
NSN 6610-00-142-9678
NSN 6645-00-533-8037
NSN 4140-01-595-4638