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 6685-00-424-7557
NSN 7035-01-344-8708
NSN 5935-01-076-4088
NSN 5999-00-331-9696
NSN 5910-01-278-7146
NSN 5960-00-557-0772
NSN 5905-01-152-1367
NSN 6220-01-272-3177
NSN 5960-00-892-8632
NSN 5998-01-581-7499
NSN 6150-01-278-1166
NSN 5895-01-634-0630