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 5996-00-252-3495
NSN 5960-01-431-2487
NSN 6150-01-591-1717
NSN 5990-01-203-4075
NSN 6320-01-465-2028
NSN 5905-01-633-1367
NSN 6645-01-484-9847
NSN 6220-01-366-6747
NSN 6645-01-510-3496
NSN 6220-01-361-3483
NSN 5998-00-898-7285
NSN 2925-01-480-3351