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 5905-01-262-0082
NSN 6150-00-130-0552
NSN 6130-01-549-9033
NSN 5985-01-259-1458
NSN 6620-00-935-1321
NSN 5920-01-321-8893
NSN 6685-00-043-3739
NSN 5945-00-389-7948
NSN 6220-01-430-0442
NSN 4140-01-561-3387
NSN 6145-01-352-5925
NSN 6150-01-536-5655