With a flow rate of 5.0 GPM, this funnel filters out free water and solids down to .005 inch while you refuel. You can visually inspect your fuel supply for the dirt and water in fuel tanks that can cause microbial growth, corrosive acids, electrolysis, and rust. These contaminants can restrict flow, plug filters, corrode fittings, decrease energy level of fuel, and cause engine damage and system failures. Combat these problems by refueling with Mr. Funnel. Fuel filter is a heavy-duty fast-flow funnel made of electro-conductive polypropylene and can be grounded to bleed off static electricity. Works with gasoline, diesel, kerosene and mixed 2 cycle fuels. 10 year warranty.