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 6620-01-109-2764
NSN 5985-01-606-0083
NSN 4140-01-492-4797
NSN 5855-00-256-5562
NSN 5950-01-173-8562
NSN 6610-01-581-2975
NSN 5990-00-140-4559
NSN 5910-01-437-8506
NSN 6610-00-081-2365
NSN 6135-00-715-4001
NSN 4140-00-152-7092
NSN 5999-01-375-5270