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 6610-01-233-5857
NSN 6145-01-160-7658
NSN 6240-01-485-9868
NSN 5985-00-295-2522
NSN 5905-01-297-5814
NSN 6620-00-912-0255
NSN 6220-01-406-3167
NSN 6130-01-104-3060
NSN 5835-01-071-6376
NSN 6130-01-453-7887
NSN 5930-00-481-5018
NSN 5960-00-824-0052