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 6240-01-242-9138
NSN 6130-00-865-6558
NSN 6685-01-467-6980
NSN 5998-01-256-4441
NSN 6110-01-238-5772
NSN 5998-01-537-0150
NSN 5915-00-420-1557
NSN 7035-00-312-3055
NSN 7035-01-180-8256
NSN 5950-00-816-1573
NSN 5905-01-065-1663
NSN 6650-00-020-6966