Dorman's Water In Fuel Sensor is constructed from high-quality materials to withstand wear and tear due to repeated fuel filter service and other factors. It activates a warning signal that indicates elevated water levels in diesel fuel, enabling you to take measures to protect against fuel contamination, fuel system rust and corrosion, and engine trouble. All Dorman products are engineered in the United States and backed by 100 years of automotive aftermarket experience. Our solutions are thoroughly tested and inspected, and if you experience any difficulty installing or using our parts, we have a dedicated technical support team of ASE Blue Seal certified professionals ready to help. To learn more about our quality and innovation, visit DormanProducts.com.