OUTERWEARS ATV PRE-FILTER K N RU-3480 PART# 20-1278-01 NEW. Designed to keep out particles of dirt sand and street debris as small as .005 Dyno and flow bench testing has shown no significant loss of horse power or air intake while using this product Silicone impregnated micro-mesh is water resistant Seams are dialectically welded Material contains uniform micron sized openings that allow air in yet filters out the unwanted elements such as sand dirt clay and even water Easy to install