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 6130-01-124-1589
NSN 5935-01-408-4537
NSN 5910-01-028-0802
NSN 5975-01-634-0678
NSN 5935-01-492-9889
NSN 5965-01-389-1068
NSN 6150-01-634-0575
NSN 5930-01-025-1959
NSN 5930-01-408-6310
NSN 5920-01-127-3769
NSN 5835-00-438-4489
NSN 5960-01-352-0451