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 5915-01-116-7074
NSN 6240-01-309-0695
NSN 6145-01-254-2935
NSN 5935-01-463-2046
NSN 6620-01-068-4498
NSN 6610-01-212-6464
NSN 5998-00-959-4539
NSN 6110-00-060-5391
NSN 4140-01-206-2397
NSN 5999-00-670-7676
NSN 5915-01-532-0722
NSN 6130-01-422-2603