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 5945-01-555-8373
NSN 6110-01-391-0211
NSN 6620-00-266-2763
NSN 5975-01-513-8763
NSN 6645-00-551-8291
NSN 6105-01-420-4818
NSN 5998-01-489-5309
NSN 7035-01-287-9817
NSN 6685-00-449-7087
NSN 5985-00-829-1953
NSN 5895-00-863-0745
NSN 6645-01-025-1002