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P554471

FUEL,SPIN ON

The Donaldson P554471 is a spin-on secondary fuel filter that captures fine contaminants after the primary filter to safeguard high-pressure fuel injectors and pumps from premature wear. It threads onto the filter head with an M30x1.5 thread and delivers 99% efficiency at 9 microns. This filter is typically replaced during routine fuel system maintenance on heavy-duty diesel engines, especially when a pressure differential indicates clogging or at prescribed service intervals.