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 5910-01-499-6720
NSN 6620-00-246-5159
NSN 6620-01-023-2938
NSN 5835-00-257-2852
NSN 5920-00-185-9587
NSN 5975-00-140-8739
NSN 6620-00-104-9722
NSN 5925-00-081-9135
NSN 5999-00-099-6889
NSN 5965-00-208-4896
NSN 5915-00-898-1875
NSN 5930-00-473-8251