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 6240-00-239-0159
NSN 6110-00-104-6149
NSN 5945-01-447-1109
NSN 4140-01-580-2166
NSN 5965-01-146-6762
NSN 6150-01-196-5644
NSN 5990-00-006-5760
NSN 5950-01-489-5635
NSN 6135-01-089-4888
NSN 5915-00-269-4463
NSN 5945-01-469-6287
NSN 5935-01-123-6572