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 6610-01-216-5594
NSN 6620-01-659-1256
NSN 5998-01-413-2475
NSN 6105-00-164-4232
NSN 5925-01-202-6171
NSN 5855-00-237-4088
NSN 5920-00-196-3631
NSN 6110-00-256-6614
NSN 5990-00-822-9269
NSN 5998-01-152-2819
NSN 6610-00-542-6307
NSN 6620-01-650-5226