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 5996-00-990-2192
NSN 5935-01-006-8217
NSN 7035-01-448-4740
NSN 6110-00-877-2940
NSN 6220-01-164-5228
NSN 7035-00-946-2642
NSN 6620-00-720-3278
NSN 5950-00-740-3893
NSN 5910-01-243-1798
NSN 5990-01-532-6113
NSN 5945-00-289-9859
NSN 6150-01-134-4318