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 5950-01-502-7019
NSN 6620-00-321-3630
NSN 6240-01-522-7045
NSN 4140-00-483-9641
NSN 5895-01-541-5274
NSN 6105-00-247-8695
NSN 6105-00-943-1289
NSN 5975-00-617-7138
NSN 5975-00-374-5245
NSN 5855-00-125-0780
NSN 6650-00-456-1736
NSN 5985-01-116-2147