Boss thread is 7/8-14 and the flare thread is 3/4-16
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.
NSN 5998-00-799-9704
NSN 6650-01-592-2445
NSN 6685-01-397-0117
NSN 5905-01-127-0973
NSN 5998-00-507-7818
NSN 2925-01-495-2690
NSN 6650-01-014-7671
NSN 5985-01-081-0899
NSN 5985-00-497-5521
NSN 6610-01-597-7175
NSN 6610-00-925-5064
NSN 2925-00-464-7892