A spring steel ringlike item designed to be placed between a piston ring and the piston to maintain the correct piston ring pressure against the cylinder wall.
NSN 6620-01-537-1813
NSN 6645-01-157-9080
NSN 4140-01-569-5523
NSN 5945-01-085-9804
NSN 2925-01-412-9520
NSN 5999-01-461-3052
NSN 5935-01-027-0915
NSN 5910-01-202-8330
NSN 5930-01-383-3278
NSN 5910-00-891-4245
NSN 5930-01-407-2818
NSN 5996-00-642-9832