Donaldson Fuel Filter Water Separator – Part No. P551026 The Donaldson P551026 is a spin-on fuel filter and water separator featuring Twist & Drain™ technology, engineered to protect diesel engines by removing solid contaminants and separating water from fuel. Its robust design and high-efficiency media ensure reliable fuel cleanliness in demanding applications. Key Features: Dual-Stage Filtration Combines cellulose and meltblown media to remove particles down to 10 microns with 99% efficiency, while separating 95% of emulsified water to safeguard injectors and pumps. Twist & Drain™ Maintenance Integrated twist-to-drain valve lets you discharge accumulated water without removing the cartridge, simplifying servicing and minimizing fuel spillage. Heavy-Duty Construction Sturdy canister and seal materials withstand vibration and pressure fluctuations for extended service life in heavy-duty environments. Specifications: Outer Diameter: 107.3 mm (4.22 in) Length: 243.6 mm (9.59 in) Thread Size: 1-14 UN Gasket Outer Diameter: 99 mm (3.90 in) Gasket Inner Diameter: 90.3 mm (3.56 in) Filtration Efficiency: 99% @ 10 µm (ISO 19438 / SAE J1985) Emulsified Water Separation: 95% (SAE J1985) Media Type: Cellulose and meltblown Style: Spin-on, Twist & Drain™ Typical Applications: Heavy-Duty Trucks & Buses Ensures clean, dry diesel fuel for on-highway and vocational vehicles. Off-Road & Industrial Equipment Fits construction machinery, agricultural tractors, and mining equipment requiring reliable water separation. OEM Retrofit & Aftermarket Replacement Cross-references many OEM part numbers (for example, Baldwin BF1363, Fleetguard FS19737, Mann+Hummel PL4207X, Mercedes-Benz 9604770003, Volvo 11110474). Use Part No. P551026 to maintain fuel-system integrity, prevent water-related corrosion, and extend component life in demanding diesel applications
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