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 5920-01-576-9869
NSN 5835-00-140-8646
NSN 5930-01-243-2357
NSN 5950-00-859-0917
NSN 6145-01-032-4557
NSN 5895-01-415-3309
NSN 6135-01-162-0943
NSN 5945-00-851-7911
NSN 6620-00-151-5363
NSN 5960-01-226-6898
NSN 5999-00-568-4807
NSN 6220-01-324-9002