Burris Briggs OHV Compression Rings - The Burris replacement compression ring for the Briggs OHV engine (Animal, World Formula and LO206) is a low tension piece that retains a high level of cylinder sealing while reducing drag in the bore. *All Burris pistons and rings are aftermarket replacement parts and not manufactured by the OEM. Reference to a particular engine type or manufacturer is intended to be descriptive and for identification purposes only.