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 5920-00-243-2023
NSN 5910-01-324-0515
NSN 5999-01-193-8312
NSN 5895-01-393-9740
NSN 5905-01-460-0744
NSN 5895-01-225-9964
NSN 5935-01-112-7985
NSN 5945-01-290-2437
NSN 6610-01-173-0465
NSN 6145-01-388-4480
NSN 5915-01-490-3829
NSN 5910-01-401-5279