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 5990-01-107-1003
NSN 7035-01-646-5193
NSN 6685-01-355-3550
NSN 6610-00-015-9383
NSN 5930-01-039-5457
NSN 5990-01-457-9386
NSN 5998-00-804-9956
NSN 5950-00-925-9391
NSN 5975-01-509-3265
NSN 5996-01-393-7166
NSN 6105-01-463-7677
NSN 5990-01-591-8797