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 6650-00-170-5095
NSN 4140-01-419-4949
NSN 5990-00-935-5610
NSN 5950-01-205-2578
NSN 5920-01-602-2627
NSN 5998-01-463-8410
NSN 5925-00-959-6075
NSN 6240-01-341-6579
NSN 6105-00-959-5468
NSN 6645-01-553-8500
NSN 6135-01-576-9616
NSN 5920-01-116-1789