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 6130-00-558-5844
NSN 5999-01-063-7408
NSN 5930-00-175-8720
NSN 5905-01-357-6993
NSN 5999-00-940-7410
NSN 2925-01-463-8856
NSN 5960-00-038-5433
NSN 6110-01-552-0101
NSN 5960-01-384-4603
NSN 6610-01-618-7038
NSN 6610-00-269-4506
NSN 6130-00-479-9746