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 5998-01-005-0310
NSN 6135-01-125-4867
NSN 5999-00-097-9044
NSN 6110-01-359-8715
NSN 5975-01-564-3179
NSN 5999-01-535-7098
NSN 6220-01-509-2664
NSN 5915-00-340-9803
NSN 6240-01-301-5412
NSN 5998-00-850-2363
NSN 4140-01-567-2701
NSN 5835-01-362-0305