The Donaldson P502521 is a high-quality fuel filter water separator spin-on cartridge designed to protect engine fuel systems from contaminants and water. Featuring a 10-micron cellulose media, this filter ensures clean fuel delivery, crucial for the optimal performance and longevity of diesel engines. It serves as an aftermarket replacement for various OEM part numbers, including SAME 01183574, and is commonly used in a wide range of SAME, Deutz-Fahr, Lamborghini, and Hürlimann agricultural tractors and equipment.