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 6110-01-055-3507
NSN 5925-01-417-1942
NSN 6645-00-121-7566
NSN 6135-01-062-9356
NSN 5945-01-441-9801
NSN 6220-00-375-0473
NSN 5960-01-567-1096
NSN 5999-00-968-6393
NSN 5950-00-947-3345
NSN 6620-01-360-1571
NSN 7035-01-254-3044
NSN 5855-00-300-1873