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 5910-01-416-3409
NSN 6620-00-449-1973
NSN 5835-01-619-6268
NSN 5945-00-411-5498
NSN 6320-01-651-7476
NSN 5925-00-994-3398
NSN 6145-01-532-4764
NSN 5950-01-418-7797
NSN 5960-01-094-5958
NSN 7035-01-580-1492
NSN 6150-01-552-1161
NSN 5920-00-529-0618