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 5905-00-630-9860
NSN 6320-00-646-3311
NSN 6685-01-198-5776
NSN 5950-01-397-9885
NSN 6620-01-464-6762
NSN 5950-01-240-7503
NSN 5950-01-171-2796
NSN 5965-01-516-1236
NSN 5950-00-619-5781
NSN 5975-01-627-5393
NSN 4140-00-038-4276
NSN 5975-00-925-9570