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 5835-01-266-4382
NSN 5920-01-081-1096
NSN 5910-01-003-5968
NSN 6240-01-234-1594
NSN 6150-01-183-3134
NSN 6130-01-592-7316
NSN 5996-01-227-4496
NSN 6110-00-226-1753
NSN 6645-01-147-5579
NSN 6110-01-525-6326
NSN 6110-01-340-4387
NSN 6145-01-469-5821