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 6645-01-538-5041
NSN 4140-00-751-1694
NSN 5945-00-064-2866
NSN 6685-01-132-7474
NSN 5999-01-634-0576
NSN 5945-01-242-1839
NSN 6320-01-390-5385
NSN 6685-01-309-5768
NSN 5975-01-591-9336
NSN 5998-01-578-6064
NSN 5935-00-360-1968
NSN 6620-01-121-4019