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 6610-01-540-5424
NSN 5935-01-522-1484
NSN 5985-01-075-9134
NSN 2925-01-506-6975
NSN 6650-01-094-4663
NSN 5895-00-081-2219
NSN 5935-01-027-0704
NSN 5920-01-581-6596
NSN 6610-00-883-2804
NSN 4140-00-328-1527
NSN 6150-01-607-7989
NSN 5930-01-242-0055