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 5945-01-325-7352
NSN 6610-01-327-3187
NSN 6150-01-411-6299
NSN 5950-01-327-7638
NSN 5975-00-541-8531
NSN 6105-00-904-3327
NSN 5975-01-421-2096
NSN 5999-01-132-8844
NSN 5990-01-204-6163
NSN 6685-00-187-1058
NSN 6610-00-239-2374
NSN 6650-01-461-7226