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 5910-00-224-7724
NSN 6645-01-303-6792
NSN 6685-01-125-0026
NSN 5998-01-115-9105
NSN 5985-01-588-1046
NSN 5999-01-399-7254
NSN 5905-01-586-8155
NSN 5835-00-148-9719
NSN 5960-01-269-6045
NSN 6240-01-461-9635
NSN 5945-01-604-1757
NSN 5915-01-474-6197