The Outerwears 20?1029?03 Pre?Filter is a specialized protective accessory designed to keep contaminants out of your fuel system when filling up through a funnel. This pre?filter integrates a water?repellent mesh with a funnel?ready design that helps prevent moisture, dirt, sand and wind?blown debris from entering your tank during refueling ? especially useful in dusty, sandy or off?road conditions. Made from a durable polyester mesh, it traps particles down to approximately 0.005?inches in diameter while still allowing smooth, unrestricted flow of fuel. Its universal size fits most 6?quart funnels and adds a layer of protection that keeps water and particulate matter from compromising fuel quality, helping you maintain cleaner fuel and better engine performance.