No other part numbers with same form, fit, and function found.
A tube coupling nut with the shank end accommodating a smaller tube size than is accommodated by the tube fitting which connects to the threaded end.
NSN 5975-00-560-8080
NSN 5855-01-076-2741
NSN 5999-01-451-4906
NSN 5965-01-415-9196
NSN 7035-01-281-3642
NSN 5998-01-530-3022
NSN 5999-00-021-7819
NSN 6620-01-601-4314
NSN 5905-01-352-8018
NSN 5835-00-190-3401
NSN 5835-01-447-2544
NSN 6110-00-038-7230