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 5930-00-394-0263
NSN 5985-01-136-9252
NSN 4140-01-400-3610
NSN 5915-00-965-0535
NSN 6620-00-917-5259
NSN 5915-00-205-2615
NSN 6150-01-655-2619
NSN 6645-01-535-0719
NSN 5920-01-223-0747
NSN 5998-01-573-6064
NSN 5965-00-994-3190
NSN 6110-01-025-9773