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 6610-01-527-1793
NSN 5910-01-615-8587
NSN 6135-01-572-8530
NSN 5996-01-123-4349
NSN 5910-01-563-0057
NSN 5990-01-259-7138
NSN 6645-00-864-6794
NSN 6145-01-442-7395
NSN 5835-01-209-6410
NSN 6240-01-557-1177
NSN 6150-00-901-7264
NSN 6610-00-604-0045