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 6320-00-500-4172
NSN 5855-01-351-8909
NSN 5965-00-964-1756
NSN 5996-01-023-8370
NSN 6105-00-604-5384
NSN 5910-01-311-4604
NSN 6150-00-171-3325
NSN 5960-01-522-0391
NSN 5996-01-039-2704
NSN 2925-01-350-0200
NSN 6610-01-155-2661
NSN 6130-01-070-5508