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 5925-01-411-6028
NSN 6110-01-432-2442
NSN 5975-01-401-5355
NSN 5950-00-383-2826
NSN 5925-01-421-5731
NSN 5996-01-383-1478
NSN 5975-01-480-7899
NSN 6110-00-596-9124
NSN 6240-00-215-8550
NSN 5996-01-632-8109
NSN 5945-01-154-3143
NSN 6240-00-924-5393