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 6145-01-566-0164
NSN 6150-00-721-3945
NSN 6610-01-608-2899
NSN 5935-01-573-7519
NSN 5945-01-113-7250
NSN 5935-01-107-4703
NSN 5996-01-167-0027
NSN 5910-01-206-4519
NSN 6130-01-411-6089
NSN 5965-00-337-0777
NSN 5990-01-604-0862
NSN 6650-01-218-9337