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 6150-00-177-8328
NSN 6130-00-483-9766
NSN 6685-01-441-7568
NSN 5930-01-504-6362
NSN 6150-01-308-0070
NSN 5950-01-373-5036
NSN 4140-01-013-2536
NSN 5999-01-411-5135
NSN 6685-00-890-8410
NSN 6620-01-254-3609
NSN 2925-01-055-9705
NSN 5910-00-740-7286