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 6135-01-338-2281
NSN 6135-00-299-6918
NSN 6110-01-352-4891
NSN 6105-00-420-2335
NSN 5985-00-105-7686
NSN 6130-01-562-7336
NSN 5965-01-356-6340
NSN 5975-01-442-3725
NSN 5920-01-244-0476
NSN 6220-01-263-6602
NSN 5930-00-114-2734
NSN 5905-01-513-1877