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 6145-01-576-6575
NSN 6150-00-324-4409
NSN 6150-01-056-5288
NSN 5975-01-110-5874
NSN 6620-00-466-2314
NSN 6150-00-719-6119
NSN 5910-01-270-8660
NSN 6130-01-252-7311
NSN 6130-01-472-4288
NSN 5990-01-147-5225
NSN 6145-00-156-4394
NSN 6650-01-412-1040