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 5985-01-440-9350
NSN 5895-01-450-7344
NSN 5905-01-479-3476
NSN 6650-01-142-5540
NSN 5835-00-080-8213
NSN 5910-01-463-8455
NSN 5975-01-228-8885
NSN 4140-01-425-7955
NSN 6220-01-523-3744
NSN 5935-01-449-8681
NSN 6135-00-295-2614
NSN 5935-01-415-6314