Size: 42mm-iv; bushing diameter: 1.6535 inch
No other part numbers with same form, fit, and function found.
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 5999-00-342-6322
NSN 4140-00-585-6306
NSN 6650-01-414-9784
NSN 5998-01-240-7714
NSN 6620-01-342-5953
NSN 5835-01-054-9016
NSN 6685-00-162-2052
NSN 5895-00-792-6864
NSN 6145-00-155-5297
NSN 6220-01-309-4895
NSN 5990-01-258-0512
NSN 6110-01-602-8261