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 5925-01-634-0664
NSN 6240-01-476-7935
NSN 4140-01-315-1986
NSN 2925-01-487-0886
NSN 5999-01-611-0236
NSN 5910-00-707-3268
NSN 6110-01-086-3688
NSN 6320-01-203-4303
NSN 6610-01-606-8788
NSN 5960-00-755-7017
NSN 6685-01-154-7114
NSN 5925-01-093-9455