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 6320-00-931-4855
NSN 4140-01-607-7883
NSN 6150-01-544-1390
NSN 6650-01-338-6042
NSN 5905-00-106-1278
NSN 5905-01-460-1573
NSN 5920-00-469-5154
NSN 6645-01-370-4259
NSN 6620-01-552-9024
NSN 2925-00-290-7052
NSN 6135-01-071-4923
NSN 6650-01-217-0303