A fitting with pipe threads having a female connection inside of a male connection, used in conjunction with another fitting, to connect in the same line, two pipes of different sizes.
NSN 5905-00-288-1907
NSN 5996-00-682-2226
NSN 5930-01-612-7127
NSN 6135-00-583-3966
NSN 5945-01-480-8031
NSN 6105-01-595-9044
NSN 5935-01-200-7035
NSN 6145-01-438-5817
NSN 5960-01-061-9166
NSN 5999-00-686-1519
NSN 5975-01-420-9539
NSN 5998-01-185-0059