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 6110-00-653-3936
NSN 5996-01-415-3098
NSN 6620-00-585-5443
NSN 6685-00-216-6676
NSN 5960-00-724-5787
NSN 6650-01-591-8574
NSN 6150-01-112-2572
NSN 5945-01-462-1555
NSN 6620-00-329-9474
NSN 5945-01-425-1749
NSN 5960-01-598-7371
NSN 5855-01-634-0259