The Caterpillar 1R1804 is a genuine Cat High Efficiency Secondary Fuel Filter designed to provide superior protection for critical engine components by effectively removing contaminants from fuel. Featuring a 4 micron absolute rating and 1-14 UNS-2B thread, this filter ensures clean fuel delivery, optimizing engine performance and longevity in demanding agricultural, construction, and industrial applications. It has an overall height of 181.9 mm and an outer diameter of 93.7 mm.