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 6650-01-541-2628
NSN 6610-00-303-0338
NSN 6645-01-139-0156
NSN 5930-01-502-6215
NSN 5965-00-682-3567
NSN 5960-00-102-8128
NSN 6685-01-275-1242
NSN 5855-01-175-1457
NSN 5950-01-437-7126
NSN 6650-00-518-5194
NSN 5999-01-235-9285
NSN 6150-01-588-4894