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 6610-01-573-5949
NSN 5910-01-388-2895
NSN 6650-01-084-5537
NSN 5920-01-400-0791
NSN 5945-00-376-2195
NSN 5935-00-325-0989
NSN 5920-00-561-1309
NSN 5990-01-390-2177
NSN 6685-01-139-0270
NSN 5996-00-758-4088
NSN 6685-01-152-2846
NSN 6620-00-303-0358