The Donaldson P558239 is a genuine Spin-On Fuel Filter and Water Separator designed for optimal engine protection. This high-quality filter effectively removes contaminants and separates water from fuel, ensuring clean fuel delivery and extending engine life. It features an M16 x 1.5 thread, 93 mm outer diameter, and 177 mm length. This filter is a direct replacement for various Caterpillar, JCB, and Perkins applications, including OEM part numbers 1R0750, 32925903, and 26560201.