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 6610-01-212-9817
NSN 6220-01-551-1681
NSN 6240-01-068-3491
NSN 6130-01-309-6739
NSN 5965-00-524-5521
NSN 6610-00-946-6146
NSN 6220-01-649-4932
NSN 5920-01-287-8409
NSN 5990-01-053-5115
NSN 4140-00-660-8699
NSN 5930-00-107-2593
NSN 6135-01-307-6006