Oregon 30-943 Foam Pre-Cleaner Lawn Mower Air Filters Oregon 30-943 Replacement Kohler Foam Pre-Cleaner Pre-oiled Foam Pre-cleaner 6-3/8" L x 3-1/4" W Use With Oregon 30-088 Replaces Kohler 12-083-12 after serial 2404900004, Oregon 30-517