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 6145-01-438-0368
NSN 6130-01-191-1959
NSN 6610-00-994-8472
NSN 5975-00-719-9793
NSN 5895-00-587-1450
NSN 6650-00-957-0714
NSN 6110-01-462-5521
NSN 6320-01-454-1965
NSN 6240-01-283-0404
NSN 6105-01-414-3867
NSN 6320-01-302-5157
NSN 5915-00-518-3343