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 6220-01-249-3884
NSN 5915-01-656-8877
NSN 6620-00-940-9870
NSN 6320-01-415-0953
NSN 5999-00-586-7160
NSN 6130-00-375-6299
NSN 5945-00-182-7384
NSN 5990-01-632-0969
NSN 5975-01-205-3607
NSN 5935-01-239-5248
NSN 5905-00-100-5250
NSN 6240-01-544-5712