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 6685-00-006-7915
NSN 5935-01-485-1749
NSN 6320-01-064-0372
NSN 5935-01-575-8564
NSN 6145-01-470-1151
NSN 5990-00-199-0081
NSN 5925-01-093-2484
NSN 5999-01-447-3838
NSN 6645-00-258-8547
NSN 5855-01-330-3669
NSN 5925-01-200-2714
NSN 6650-01-407-4653