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 5996-01-252-2921
NSN 5990-01-252-8175
NSN 5998-01-528-8659
NSN 5999-00-100-4308
NSN 6685-00-106-7481
NSN 6130-00-215-2664
NSN 5990-00-893-8998
NSN 5910-00-448-8842
NSN 6610-01-633-8931
NSN 6320-00-646-3311
NSN 6650-00-854-0265
NSN 5910-01-492-1650