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 6220-01-008-7401
NSN 5920-00-912-2823
NSN 6610-01-217-4162
NSN 5975-01-221-5930
NSN 6620-01-641-8741
NSN 5965-00-942-1602
NSN 5998-01-465-4515
NSN 5895-01-133-0834
NSN 6145-00-082-5172
NSN 5925-01-634-0664
NSN 6130-01-374-2545
NSN 5945-00-308-3944