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 5985-01-521-3230
NSN 5835-00-113-6090
NSN 6130-01-190-2326
NSN 6110-00-267-7422
NSN 2925-00-456-7627
NSN 5945-01-254-4403
NSN 5835-01-281-7281
NSN 5998-01-166-6614
NSN 6220-00-541-8515
NSN 5925-01-444-3880
NSN 5985-01-454-1124
NSN 6130-01-014-5419