This FS19816 fuel filter is a diesel fuel water separator filter for heavy trucks. It can separate water and filter solid impurities from diesel, supply clean fuel to engine injection system, protect fuel injector and high-pressure fuel pump, reduce fuel system failure. Adopted composite filter media with excellent water removal performance. The filter housing is corrosion-resistant. The sealing rubber ring prevents diesel leakage. Every filter passes sealing test and filtration efficiency test before delivery. It is an essential replacement spare part for truck engine fuel system maintenance.