Donaldson Company Fuel Filter, Secondary Screw-On Part No: P555627

The Donaldson P555627 Secondary Screw‑On Fuel Filter is engineered to provide dependable secondary filtration for heavy‑duty diesel engines and equipment. Positioned downstream of the primary fuel filter, it captures fine contaminants that are too small for the first stage to trap, helping reduce wear on critical components such as fuel pumps and injectors. Its secure screw‑on design and robust construction ensure reliable performance under demanding conditions. Ideal for commercial trucks, vocational vehicles, and diesel equipment, the P555627 supports cleaner fuel delivery, improved engine efficiency, fewer unscheduled repairs, and longer service intervals — helping maintain dependable operation and fuel system longevity.