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 6150-01-250-3932
NSN 6145-01-655-4185
NSN 6650-00-196-0637
NSN 5920-01-265-4002
NSN 5960-00-910-3690
NSN 6135-01-502-5787
NSN 6320-01-544-6447
NSN 5930-01-512-0205
NSN 6620-00-404-0149
NSN 6610-00-318-8540
NSN 5895-00-459-5825
NSN 6240-01-183-3540