Part 1288310-S1, Air Filter, is a genuine OEM part manufacturered by Kohler. The manufacturer describes it as "Kohler Air Filter/Precleaner Kit, tall for PRO CV11". Kohler Air Filter/Precleaner Kit, tall for PRO CV11-16, CV460-493 Engines It is used in Exmark Lawn Mowers. Do not use compressed air to clean filter. Replace if dirty or torn. Clean mounting surface.