Boss end has a viton o-ring, thread size on both ends is 0.375.
An adapter having standard pipe threads on one end or an unthreaded end designed to accommodate a pipe. 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 pipe or pipe fitting to a boss or boss fitting in a straight line on items such as tanks, housing, valve fittings, or the like. See also adapter bushing and coupling, pipe.
Classification: Other fittings nesoi of iron or nonalloy steel
NSN 6650-00-197-7563
NSN 4140-01-146-5409
NSN 5998-01-195-2603
NSN 6220-01-547-6285
NSN 6650-00-344-9500
NSN 5915-01-188-5568
NSN 5925-01-317-3869
NSN 5998-01-534-7301
NSN 6610-01-023-1918
NSN 6145-01-159-1180
NSN 6610-01-502-3057
NSN 6240-00-514-3507