Quicksilver 35-802893Q01 Water Separating Fuel Filter This 25 micron Mercury filter separates water and other impurities from the fuel to increase engine performance. Fuel contamination can result in poor engine performance, stalling, and damage to fuel system components. The filters metal shell features a durable paint finish to resist corrosion in fresh and saltwater marine environments. The filters internal surfaces are coated in an epoxy finish to resist rust and provide a long working life.