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 6610-01-067-4359
NSN 6110-01-572-8728
NSN 5855-01-561-0057
NSN 6135-01-469-6429
NSN 6620-01-557-1941
NSN 5925-00-936-8096
NSN 5999-00-873-3812
NSN 5920-01-228-0577
NSN 6150-01-323-9137
NSN 6145-00-947-4092
NSN 5950-01-462-5982
NSN 5905-01-112-9058