Description Fleetguard FS1040 is a genuine spin-on diesel fuel/water separator filter using Stratapore media, providing 25 micron filtration with 98.7% efficiency and 95% free and emulsified water separation for suction-side fuel systems on Cummins ISX and Signature 600 engines and other heavy-duty applications. It features M85 x 2-7H threads, approximately 294 mm overall height and 118 mm outside diameter, with a drain valve and water-in-fuel sensor port, and commonly replaces Cummins 3101872 and 4010651, Donaldson P551047, Case IH 419858A1, New Holland 441701A1, Ingersoll-Rand 57645228 and Terex 6002142 filters.