Genuine Caterpillar Filter 326-1643 comes with IHD Strap wrench. Built to extend the life of your secondary filter and precision fuel system components. Advanced Efficiency Fuel Water Separators are designed to eliminate 100% free water and 90% emulsified water along with smaller contaminates while helping extend the life of your secondary filter and expensive injectors. * All fitment filter part numbers are based on your engine serial number. * Please confirm with our team if you are unsure this filter will fit your engine.