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 6150-00-155-8511
NSN 6685-01-342-7547
NSN 6105-01-423-3497
NSN 6220-01-179-6242
NSN 5895-00-975-2547
NSN 6220-00-700-5616
NSN 5895-00-577-4078
NSN 5925-00-948-3296
NSN 6145-01-423-9430
NSN 5895-01-433-9718
NSN 5935-01-184-8498
NSN 6150-00-949-1984