Mr. Funnel Fuel Filters (#F3C) remove water, dirt, and debris from fuel. As fuel sits, it collects condensation, water and debris. One of the leading causes of engine failure is contaminated fuel. The Fuel Filter Funnel works with standard Gasoline, Diesel, Heating Oil, and Kerosene. It's Simple, Portable, and Self Cleaning. Made from Industrial Grade Conductive Polypropylene. Just pour the fuel through Mr. Funnel and it instantly removes water and debris. There is nothing else like it on the market. Just pour the contaminated fuel into the filter and the water free fuel flows through. Any water that was in the fuel will stay in the funnel just dump it out when you've filled your appliance. To clean, just turn it upside down and whack it onto a hard surface. Nothing to replace, ever. Model F3C filters up to 3.5gpm and can be used with the Mr. Funnel Fuel Filter Extension Tube ("A FLO 203EXT" sold separately) for hard to reach places.