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 5990-01-291-0600
NSN 6620-01-032-3937
NSN 6220-01-513-9279
NSN 6135-01-461-6521
NSN 5999-01-503-3701
NSN 5998-01-231-3046
NSN 5999-00-961-8135
NSN 4140-00-237-5797
NSN 6650-01-299-5454
NSN 6685-01-077-2326
NSN 5975-00-733-5988
NSN 6610-00-189-7520