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 6620-01-628-2620
NSN 6620-00-915-0868
NSN 5965-01-442-9749
NSN 6145-01-044-8800
NSN 6135-01-441-0402
NSN 5998-00-419-0425
NSN 5905-00-117-0819
NSN 7035-01-354-9382
NSN 6105-01-541-0552
NSN 5895-01-062-2074
NSN 6610-00-856-7136
NSN 5915-01-485-8610