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 6685-01-461-9339
NSN 5905-01-549-8037
NSN 5990-00-162-7273
NSN 6645-00-296-8310
NSN 7035-01-107-2811
NSN 4140-01-362-8017
NSN 5855-01-544-7588
NSN 5950-01-012-3097
NSN 5855-00-763-2155
NSN 6645-01-349-6632
NSN 5945-00-247-3409
NSN 5895-01-594-4051