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 5965-00-627-8382
NSN 6645-01-025-1002
NSN 6645-01-127-7879
NSN 6220-01-357-0257
NSN 5996-01-461-8320
NSN 6135-01-351-2690
NSN 5960-01-462-1864
NSN 5835-01-378-6804
NSN 5990-01-081-0619
NSN 5920-00-156-0840
NSN 6130-00-540-4602
NSN 6150-01-577-7517