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 6620-01-261-0054
NSN 5925-00-286-8502
NSN 6240-00-125-6559
NSN 5895-01-168-8738
NSN 6240-01-012-3976
NSN 5935-01-626-3735
NSN 5996-01-474-8325
NSN 6685-01-334-6091
NSN 5935-01-592-1655
NSN 5998-00-365-1213
NSN 5975-01-088-7470
NSN 5985-01-209-9164