Adapter has 0.500 in. Wrenching flats
An adapter having standard pipe threads on one end or an unthreaded end designed to accommodate a pipe. The other end has machine threads (straight threads other than pipe or hose series) designed to accommodate a tube or is unthreaded and designed to accommodate a tube. It is designed to join a pipe or pipe fitting to a tube or tube fitting in a straight line.
NSN 5999-00-259-1722
NSN 5835-01-167-1824
NSN 5996-01-398-0037
NSN 6105-01-653-0968
NSN 5945-00-618-0199
NSN 6650-00-500-6455
NSN 6150-00-800-3652
NSN 5996-01-542-0903
NSN 6105-01-420-7561
NSN 7035-00-232-4043
NSN 5950-00-597-3661
NSN 2925-00-373-8837