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 6145-01-633-4397
NSN 5925-00-547-5149
NSN 5975-00-372-6265
NSN 6150-00-265-7799
NSN 6240-00-252-7695
NSN 5925-00-491-6536
NSN 5945-01-350-5662
NSN 5985-00-993-6971
NSN 5855-01-534-3724
NSN 6240-01-106-6113
NSN 6685-01-008-7589
NSN 5990-01-180-7365