K&N 33-2421 is a synthetic, oil-free direct replacement filter, intended for use on select Cub Cadet, Kohler, and Toro models. It was specifically designed to be the ideal replacement for outdoor equipment. K&N air filters provide high air flow while maintaining excellent filtration. The reduced restriction allows your engine to breathe more efficiently. K&N air filters are washable and reusable. Cleaning is easy with K&N synthetic filter cleaner.