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 5835-01-488-6678
NSN 5965-01-181-3140
NSN 6150-00-422-3829
NSN 7035-01-162-7452
NSN 5930-01-479-6025
NSN 6320-00-218-6105
NSN 5920-01-107-7541
NSN 5999-01-485-2121
NSN 6135-00-686-4777
NSN 6220-00-221-5899
NSN 6130-01-557-9698
NSN 5950-01-158-0383