6.7 Cummins Fuel Filter Water Separator Set Fits for 2019 2020 2021 2022 Dodge Ram 2500 3500 4500 5500 6.7L Diesel Turbo Engines 68436631AA and 68157291AA. Double-Layer Micro-Filter Paper, the Outer Layer can Obviously Filter Out the Water in the Fuel System, So as to Realize the Separation of Water and Oil.