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 5985-00-968-6381
NSN 5950-00-546-1163
NSN 5990-00-019-2486
NSN 6685-01-254-5658
NSN 5950-01-164-7778
NSN 5835-01-447-2544
NSN 2925-01-645-2948
NSN 7035-01-432-2424
NSN 5855-00-256-5562
NSN 6130-00-318-9246
NSN 6320-00-937-5625
NSN 6135-00-334-4500