Description Fleetguard FF5421 is a spin-on diesel fuel filter with StrataPore high-efficiency media, approximately 192.5 mm height, 94.5 mm outside diameter and M20 x 1.5-6H internal thread for easy replacement in heavy-duty fuel systems, suitable for selected Cummins, Doosan and Iveco engine applications plus various Case IH and New Holland agricultural equipment and Kenworth trucks where FF5421 or its BF7966/P550881 equivalents are specified for fine particulate removal and protection of modern diesel injection components. (westernfilters.net.au)