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 5998-01-563-7960
NSN 5925-01-188-4303
NSN 5990-01-529-6347
NSN 5910-01-476-3518
NSN 5999-01-039-7371
NSN 6110-01-488-9153
NSN 5895-01-097-3338
NSN 5999-01-360-6276
NSN 5835-00-222-3956
NSN 5915-00-189-0773
NSN 5996-00-356-0680
NSN 6105-00-009-8770