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 5999-00-887-4733
NSN 6110-01-073-3525
NSN 6610-01-406-4985
NSN 5925-01-595-6276
NSN 5935-01-215-1216
NSN 6130-00-523-1859
NSN 6650-00-658-9627
NSN 6135-01-313-8323
NSN 5945-00-102-1348
NSN 5910-01-340-9867
NSN 6620-01-495-3536
NSN 6650-01-562-9944