A pre-filter is installed between the vehicle’s fuel tank and original fuel filter, and the simplest way to think about it is this filter catches rocks, and the factory filter catches remaining pebbles.
Glass fiber, Fuel filter paper, Composite paper
Cross Reference For 0020921901
Baldwin BF7988, Fleetguard FF5642, Mann 6650359120, WK940/23, WK94023,
MTU 0020921901,002 092 19 01, 20921901 SDMO 330510030