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 5905-00-853-1368
NSN 6650-00-788-1461
NSN 5915-01-170-6753
NSN 6110-01-137-2171
NSN 5998-01-558-5363
NSN 5935-01-194-8656
NSN 5996-00-106-4177
NSN 6650-01-230-1501
NSN 5920-00-173-4434
NSN 5975-01-100-3222
NSN 6685-01-411-2717
NSN 7035-01-182-1086