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 5920-00-451-0463
NSN 5996-00-925-1953
NSN 6130-00-956-8834
NSN 6220-01-443-1213
NSN 5910-00-935-6459
NSN 6610-01-326-0119
NSN 5960-01-350-2925
NSN 5998-01-357-8085
NSN 6145-01-021-9278
NSN 5990-01-463-2279
NSN 6620-01-371-5040
NSN 5965-00-493-6008