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 5910-01-209-9194
NSN 4140-00-146-1633
NSN 6320-01-361-7467
NSN 5915-01-261-7839
NSN 6610-01-595-9809
NSN 6320-00-937-5625
NSN 6110-00-808-4121
NSN 5996-01-030-5339
NSN 6320-01-359-3921
NSN 5999-01-264-9262
NSN 6110-00-659-3348
NSN 6240-01-252-4219