4 flats on outside surface
A ring-shaped item whose outer surface is so shaped as to form a seat for the coupling nut and the fitting between which it is assembled. It is designed to be slipped over tubing or hose so that tightening of the coupling nut to the fitting compresses the sleeve against the circumference of the tubing or hose thereby effecting a tight seal between the tubing, or hose fitting and coupling nut.
NSN 6320-01-583-6809
NSN 5895-00-470-1504
NSN 5915-01-331-5097
NSN 6145-00-827-4958
NSN 6240-01-437-4936
NSN 6110-01-135-2027
NSN 5835-00-284-0882
NSN 5930-01-006-9888
NSN 5835-00-841-2650
NSN 6130-01-077-4955
NSN 5915-00-057-8787
NSN 5996-00-011-5651