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 7035-01-312-3577
NSN 6685-01-020-7235
NSN 5915-00-045-9071
NSN 5990-00-277-3763
NSN 5855-01-223-0833
NSN 6320-00-082-5868
NSN 6320-01-556-2011
NSN 5920-01-361-7812
NSN 6145-01-479-0528
NSN 5930-01-425-1352
NSN 6145-00-294-0830
NSN 5945-01-486-0224