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 6685-01-097-9062
NSN 6145-01-109-2299
NSN 2925-00-081-6835
NSN 5945-00-244-1579
NSN 6610-01-388-0563
NSN 5999-01-381-4792
NSN 5999-00-467-9305
NSN 6220-00-099-9192
NSN 6620-01-492-4271
NSN 5855-00-944-0949
NSN 5999-01-189-1733
NSN 5920-01-014-3939