Description Fleetguard FS1000 is a spin-on diesel fuel/water separator with StrataPore media, 10 micron filtration, and approximately 95% free and emulsified water separation, used to remove water and particulate contamination before the fuel injection system. The element is about 249 mm high with 93 mm outer diameter, uses a 1-14 UNS-2B thread with supplied gasket, and is commonly applied on Cummins N14, M11/ISM/ISX, ISC/ISL and Quantum 19L engines and Caterpillar C7–C15 engines, cross-referencing Cummins 3329289, Caterpillar 2568753, Baldwin BF1259, Donaldson P551000, and WIX 33406.