Underwater life support iaw navsea instruction 10560.2b
A valve permitting flow in one direction only. It does not have a stem, except when equipped with a lever and weight and has no pressure adjustment. It may be inline or cartridge (manifold) design.
NSN 5950-00-157-3785
NSN 6110-01-445-8316
NSN 5998-00-109-6384
NSN 5915-00-823-6496
NSN 5925-00-477-9644
NSN 5999-00-152-7998
NSN 5855-01-616-1353
NSN 5999-01-523-0360
NSN 5930-00-586-7036
NSN 5965-01-604-0220
NSN 6685-01-594-2075
NSN 6150-00-526-3720