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 6150-01-385-8423
NSN 5996-00-365-5483
NSN 6685-00-287-7564
NSN 5910-00-420-9057
NSN 5960-01-141-7584
NSN 5985-01-391-2729
NSN 5925-01-593-1220
NSN 6135-01-469-6429
NSN 6645-01-531-8233
NSN 5925-01-345-9418
NSN 5920-01-477-0087
NSN 5905-01-460-2699