Oval Air Filter by K&N The K&N replacement air filter for RK Series air cleaner assemblies is designed to increase horsepower and acceleration while providing excellent filtration. The air filter is washable and reusable and designed to be used as a replacement air filter for specific K&N RK Series air cleaner assemblies for Harley-Davidson motorcycles. The air filter is covered by the famous K&N Million-Mile Limited Warranty. Features Replacement air filter for specific RK Series air cleaner assemblies Washable and reusable High air flow filter media Benefits Designed to boost horsepower and rate of acceleration Provides exceptional filtration Applications Universal What\’s In The Box? 1 – Oval Air Filter Warranty K&N Million Mile Warranty