Per naval activity hx, item is no longer considered critical
A flanged cylindrical metallic item designed to be used on tubing to back up the flared end and to provide a bearing surface for the coupling nut, thereby reducing wear on the tubing flare. The inside diameter of the flanged end is countersunk to form a seat for the flare when assembled to a mating fitting.
NSN 5945-01-371-3652
NSN 5999-01-029-3025
NSN 5985-01-539-5560
NSN 5915-01-633-9845
NSN 5996-01-274-3980
NSN 5965-01-561-6782
NSN 6645-00-435-5610
NSN 6240-01-331-0841
NSN 5996-00-923-2388
NSN 5835-00-170-5238
NSN 5965-00-247-4886
NSN 4140-00-215-8593