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 6135-01-349-6285
NSN 5935-00-505-7608
NSN 5915-00-518-1644
NSN 5915-01-076-8176
NSN 2925-00-878-2196
NSN 5855-00-885-8452
NSN 5920-01-350-5140
NSN 5965-00-905-6895
NSN 5835-00-787-8122
NSN 5960-00-838-3474
NSN 5999-01-349-7718
NSN 5999-00-104-5582