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 6650-01-370-0589
NSN 5930-00-699-9439
NSN 7035-01-090-3369
NSN 6135-00-519-1325
NSN 6150-00-189-0292
NSN 6240-01-147-0379
NSN 6135-01-495-0933
NSN 6685-00-499-9233
NSN 5960-00-067-3954
NSN 6130-01-326-0336
NSN 5920-00-908-1929
NSN 5945-01-619-4458