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 5855-01-634-0259
NSN 5960-01-201-4249
NSN 6135-01-205-5965
NSN 6145-01-633-5266
NSN 5975-00-897-6624
NSN 6145-01-390-3511
NSN 2925-00-406-4381
NSN 5835-01-535-0948
NSN 5998-00-487-6040
NSN 6240-00-218-1480
NSN 5835-01-123-8305
NSN 5930-00-620-6420