PetroClear 530W filters are particulate removing and water sensing spin-on filters designed for aftermarket, cost efficient particulate filtration of fuels at high volume fueling locations such as truck stops, card lock sites, and industrial and commercial applications. They are designed to remove particulate and to sense both free and emulsified water from neat gasoline, Ethanol blended gasoline, diesel, Biodiesel, ULSD (Ultra Low Sulfur Diesel), Kerosene, fuel oils, lube oils and synthetic fluids. Particulate and water sensing spin-on filters. These filters are designed to sense water, both free and emulsi ed, and slow flow as an indicator of the presence of water in neat gasoline and diesel fuels. This filter will not sense or react to water in Ethanol blended gasoline. Available as a single filter or as a pack of 6 filters.