Kuryakyn Pre-Filter For Hypercharger ES Kuryakyn's air cleaners are designed with both performance and convenience in mind, featuring K&N and oiled gauze filters known for their water-repellent properties. Despite their robust design, a pre-filter can be a valuable addition for those seeking extra protection against the elements for their air cleaner. Features Water repellent, UV resistant and filters debris down to .005 Prevents dirt, bugs, wash water and rain from entering the air cleaner