Description Fleetguard FF5052 is a spin-on secondary diesel fuel filter used on various Cummins, Case, Komatsu, Renault and Volvo engine applications. It replaces Fleetguard FF42000 and cross-references Cummins 3903640, 3931063, 3931065; Case J903640; Volvo 243004; Donaldson P550440; Baldwin BF788 and other equivalent filters. Designed for fuel systems using an M16 x 1.5-6H threaded filter head, it provides approximately 20 micron filtration at 96% efficiency to protect injectors and high-pressure fuel components from particulate contamination.