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 5935-01-310-3731
NSN 6650-01-204-5981
NSN 5915-01-482-5502
NSN 6135-01-420-5907
NSN 6650-01-423-1348
NSN 5915-00-964-3993
NSN 5905-00-372-5214
NSN 7035-00-797-2635
NSN 6105-01-367-6005
NSN 2925-01-222-7764
NSN 5996-01-146-4202
NSN 4140-01-446-2343