The Cummins 4.161" O.D. Fuel/Water Separator is designed to protect your engine and ensure proper fuel system performance. It provides effective filtration, capturing and separating water and particles down to a certain micron rating. This fuel/water separator is constructed with a durable design that is resistant to the fuel environmental conditions. With this fuel/water separator, you can be sure that your engine is receiving the cleanest fuel possible. FleetPride is your First Click in Heavy Duty®.