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 5985-01-455-5747
NSN 5996-01-415-1818
NSN 5910-00-341-6114
NSN 5950-01-599-9451
NSN 5915-01-191-3762
NSN 6145-01-633-7437
NSN 5985-01-015-4408
NSN 6130-01-141-8795
NSN 5965-00-225-1848
NSN 5965-00-455-7581
NSN 5985-01-428-6830
NSN 7035-00-631-3782