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 5965-01-367-2275
NSN 5998-01-008-8291
NSN 6240-01-399-4105
NSN 6135-00-175-7132
NSN 5855-01-273-6132
NSN 5930-01-039-9029
NSN 4140-00-469-4407
NSN 6110-00-418-8106
NSN 6240-01-251-2462
NSN 6150-00-158-4609
NSN 5990-00-170-4239
NSN 5945-01-391-7485