The Donaldson P550166 is a high-performance Spin-On Fuel Filter engineered to deliver superior fuel system protection. With a 10-micron efficiency rating, this filter effectively captures contaminants, ensuring clean fuel delivery to the engine for optimal performance and extended service life. It features an M16 x 1.5 thread for secure installation and is a common cross-reference for various OEM applications, including Caterpillar 1R0749 and John Deere RE509031, making it suitable for a broad range of heavy-duty agricultural and construction equipment.