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 5996-01-391-4529
NSN 6240-01-379-4547
NSN 5999-01-130-6262
NSN 5999-00-729-5112
NSN 5975-01-655-4122
NSN 5998-00-171-9998
NSN 5950-01-203-4733
NSN 5945-00-224-7365
NSN 5960-00-117-6969
NSN 5965-01-258-5662
NSN 6610-01-468-0679
NSN 6645-01-172-4477