Special o-ring material, per mil-p-5510c, do not dupe to any other nsn
An adapter having machine threads (straight threads other than pipe or hose series) designed to accommodate a tube on one end or an unthreaded end designed to accommodate a tube. The other end has external or internal machine threads (straight threads other than pipe or hose series) and is designed to facilitate a gasket, preformed packing, washer, or the like to form a seal at the boss. It is designed to join a tube or tube fitting to a boss or boss fitting in a straight line on items such as tanks, housings, valve fittings, and the like. See also coupling, tube and nipple, tube.
Classification: Other fittings nesoi of iron or nonalloy steel
NSN 6135-00-248-4102
NSN 5835-00-905-7165
NSN 5920-01-146-4503
NSN 6110-01-488-7797
NSN 6685-01-322-5688
NSN 2925-01-193-6689
NSN 5910-01-320-8622
NSN 5965-01-078-6776
NSN 5855-00-548-4742
NSN 5925-01-440-9364
NSN 6150-01-511-6762
NSN 5999-01-510-8567