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 5998-00-064-9634
NSN 6685-01-272-3138
NSN 5935-01-209-1338
NSN 6150-01-612-7263
NSN 5960-01-239-9651
NSN 5925-00-241-1441
NSN 6145-01-430-2784
NSN 6135-01-531-1413
NSN 2925-01-351-9748
NSN 7035-01-509-9953
NSN 6130-01-611-8921
NSN 5895-01-608-8609