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 5985-00-266-2094
NSN 6620-01-047-2787
NSN 5945-00-225-4125
NSN 6240-01-099-5844
NSN 5915-01-443-6559
NSN 6645-00-183-8812
NSN 6240-01-142-0729
NSN 5920-01-281-7354
NSN 5915-01-608-4053
NSN 6685-00-930-1769
NSN 5965-01-356-2047
NSN 5905-01-629-9727