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 6620-01-386-5914
NSN 2925-01-033-0141
NSN 6135-01-322-4655
NSN 5990-01-313-5543
NSN 5895-00-138-9245
NSN 5895-01-003-9424
NSN 6320-00-845-3261
NSN 5895-01-476-8288
NSN 5950-01-329-1001
NSN 6650-01-554-2824
NSN 4140-00-004-9000
NSN 6105-01-142-2376