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 5835-00-494-7204
NSN 6220-00-371-7589
NSN 6650-00-409-4283
NSN 6650-01-007-9193
NSN 5975-00-446-6852
NSN 5835-00-221-6628
NSN 6620-01-414-4578
NSN 5960-01-425-1454
NSN 5960-00-892-8632
NSN 5930-01-277-7188
NSN 5990-01-532-0670
NSN 6320-00-070-4544