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 6620-00-179-9079
NSN 6320-00-456-0836
NSN 6650-01-494-9956
NSN 6240-01-235-2604
NSN 6610-01-044-9351
NSN 6320-00-853-1920
NSN 5915-00-981-2774
NSN 5920-01-565-1251
NSN 5935-01-598-3916
NSN 5990-01-386-3040
NSN 6650-01-487-4949
NSN 5990-01-395-4194