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 5915-01-407-7045
NSN 5925-01-175-0858
NSN 2925-01-029-5300
NSN 6240-01-064-0949
NSN 5855-01-614-8082
NSN 6320-00-925-0558
NSN 5990-01-503-6104
NSN 5920-00-107-7154
NSN 2925-00-295-8109
NSN 6645-01-195-6207
NSN 6320-01-388-3125
NSN 6645-00-472-4048