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 6130-01-356-8226
NSN 5985-01-071-4747
NSN 5945-00-218-0012
NSN 2925-01-004-5627
NSN 6610-01-049-8747
NSN 6650-01-605-2302
NSN 6320-00-681-1324
NSN 5945-01-506-3074
NSN 5945-00-162-1327
NSN 6110-00-659-3348
NSN 5985-01-264-9240
NSN 6220-01-088-7646