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 5985-01-380-2612
NSN 5835-00-814-1359
NSN 6610-01-263-5517
NSN 5910-01-554-8441
NSN 5920-00-437-8450
NSN 6145-01-352-2808
NSN 5935-01-093-3157
NSN 6650-00-471-1117
NSN 5996-01-507-5828
NSN 5905-01-658-3047
NSN 5905-01-124-9599
NSN 7035-01-645-4885