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 6650-01-180-6834
NSN 4140-00-707-2963
NSN 6650-01-492-7809
NSN 5930-01-660-6578
NSN 4140-01-431-9065
NSN 5960-01-200-4621
NSN 5985-00-819-5613
NSN 5999-01-612-6840
NSN 6320-00-242-3300
NSN 6320-00-405-2348
NSN 5925-01-188-7630
NSN 5835-01-619-6270