Napa Gold 3379 Fuel/Water Separator Diesel Fuel Filter is a reliable choice for maintaining the efficiency of your vehicle's fuel system. This metal filter with a screw-on mounting style and a 3-inch diameter is designed for easy installation. It comes with an O-ring and is painted for added durability, making it a valuable addition to your air and fuel delivery system. Made in the United States, this NAPA fuel filter is specifically designed for diesel engines, ensuring optimal performance and longevity.