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 6620-01-195-2095
NSN 5915-01-559-8039
NSN 6110-01-017-3528
NSN 5930-01-144-1624
NSN 6220-00-212-9098
NSN 6645-00-445-8143
NSN 6150-01-316-8507
NSN 5945-00-702-0974
NSN 5950-01-267-8963
NSN 5998-01-258-4262
NSN 5895-01-483-0928
NSN 6685-01-439-1737