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 5998-01-481-7762
NSN 5945-00-069-0930
NSN 5915-00-265-0967
NSN 6150-01-155-6940
NSN 6145-00-184-1110
NSN 5920-01-519-4512
NSN 5965-00-368-8204
NSN 6135-01-326-2536
NSN 5999-01-034-1383
NSN 6110-00-078-8565
NSN 5915-00-368-4564
NSN 5985-01-355-4731