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 5895-01-522-8334
NSN 5930-01-040-7843
NSN 6320-01-358-0141
NSN 5985-01-353-5499
NSN 5990-01-251-0234
NSN 5960-01-536-9763
NSN 5930-00-349-6875
NSN 4140-01-512-6049
NSN 5965-01-633-8849
NSN 6610-00-238-1693
NSN 6650-01-429-6692
NSN 6240-00-518-3541