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 5925-00-090-7403
NSN 6650-01-078-5587
NSN 6685-01-543-1457
NSN 6620-01-279-0651
NSN 5905-01-115-1771
NSN 5975-01-140-6975
NSN 5930-01-555-5008
NSN 6130-00-289-7050
NSN 6650-01-642-0367
NSN 5960-01-093-8067
NSN 5895-00-128-6783
NSN 5895-00-260-9420