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 5998-01-397-6050
NSN 6220-01-423-7306
NSN 5990-01-541-5632
NSN 6145-00-269-4271
NSN 6650-00-684-3060
NSN 6610-01-224-3814
NSN 5945-01-497-0549
NSN 5998-00-009-9787
NSN 6685-01-420-4575
NSN 5905-01-055-5299
NSN 6645-01-232-4843
NSN 5905-01-544-3579