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 5905-00-821-2807
NSN 6320-01-478-9351
NSN 5996-01-382-5113
NSN 6240-01-633-9357
NSN 5925-01-350-4295
NSN 5910-01-495-7382
NSN 5925-01-538-7915
NSN 6650-01-311-0252
NSN 5910-01-285-1072
NSN 5998-01-576-9430
NSN 7035-00-968-4848
NSN 6685-01-414-3596