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 5965-01-202-1007
NSN 5985-01-265-8416
NSN 6135-00-377-9165
NSN 6145-00-578-7522
NSN 6220-01-335-0201
NSN 6650-00-504-9946
NSN 6110-00-646-4421
NSN 6650-01-310-3437
NSN 6105-00-079-9323
NSN 6620-01-310-4320
NSN 6645-01-371-1632
NSN 5965-00-973-9974