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 5905-01-398-2240
NSN 5930-01-625-4601
NSN 6685-00-186-9190
NSN 5855-00-936-8951
NSN 6105-00-071-8174
NSN 5930-00-760-3487
NSN 5998-00-296-8848
NSN 6240-01-352-3642
NSN 5960-01-573-6483
NSN 5999-00-932-3690
NSN 6110-01-260-9130
NSN 6620-00-035-5813