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 5990-01-311-4762
NSN 6135-01-629-6940
NSN 5915-00-112-3504
NSN 6320-01-132-2746
NSN 5855-01-245-8689
NSN 6645-00-833-2395
NSN 5895-01-414-4856
NSN 5965-00-927-4074
NSN 5985-01-400-5948
NSN 5925-00-433-6125
NSN 4140-01-634-0330
NSN 5985-00-690-5949