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 6645-00-124-9939
NSN 5920-01-426-8517
NSN 6610-01-606-0380
NSN 5835-00-333-6621
NSN 6610-01-390-6925
NSN 5915-01-421-1818
NSN 5999-00-992-7182
NSN 5965-01-509-3841
NSN 5930-01-308-4995
NSN 5920-01-360-8310
NSN 5960-00-858-9210
NSN 6650-01-415-4484