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 5950-00-595-9934
NSN 5996-01-079-2738
NSN 5925-01-160-7128
NSN 5996-00-036-7928
NSN 6130-01-025-3378
NSN 6130-00-081-2186
NSN 5895-01-204-5358
NSN 6650-01-058-5908
NSN 6320-01-106-4414
NSN 5985-01-503-0389
NSN 5975-00-449-5603
NSN 5985-00-554-4599