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 4140-01-144-1450
NSN 5835-00-733-9145
NSN 5990-01-632-0969
NSN 2925-01-139-5144
NSN 6110-01-388-2389
NSN 5998-00-106-4700
NSN 6130-00-738-7290
NSN 5945-00-156-7256
NSN 6145-01-369-1622
NSN 7035-01-551-5533
NSN 5905-01-252-9097
NSN 5960-00-916-8023