Donaldson's Fuel Filter Water Separator P551858 is a spin-on fuel filter that effectively maintains fuel cleanliness and optimizes engine performance. These filters are designed with accessible ports for bowls and seamlessly integrate with the original equipment (OE). In today's high-pressure fuel systems, even tiny particles as small as 2-3 microns can cause abrasive wear, damaging the fuel injection system and other critical engine components. With over 1100 options available, Donaldson Filters offers a wide range of meticulously engineered fuel filters, fuel managers, coalescers, and fuel/water separators to protect your engine and ensure its longevity. Trust Donaldson for reliable fuel filtration solutions.