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 5965-00-482-7945
NSN 5920-01-421-5362
NSN 5905-01-398-0605
NSN 5855-00-411-8688
NSN 6650-01-578-5519
NSN 6240-00-450-0675
NSN 5960-00-051-0132
NSN 2925-01-415-2140
NSN 6645-00-074-4580
NSN 7035-00-890-7649
NSN 4140-00-973-8185
NSN 5975-01-513-1146