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 6685-00-900-4246
NSN 5920-01-167-8908
NSN 4140-01-164-3575
NSN 5855-01-046-7273
NSN 5998-01-444-0587
NSN 5996-01-430-3351
NSN 5965-01-032-0940
NSN 5998-00-278-7350
NSN 5910-01-287-0555
NSN 5960-00-866-9660
NSN 5915-00-518-1644
NSN 5925-00-494-4685