The Fleetguard FS19591 is a high-efficiency fuel water separator filter designed to protect engine components by effectively removing water and contaminants from fuel. This genuine Fleetguard filter is a direct replacement for various Case IH and New Holland OEM part numbers, including 84210339, 87406086, 87406087, 87679366, and 87679367. It features a thread size of M16 X 1.5-6H INT, an overall height of 180.34 mm, and an outer diameter of 93.73 mm, providing 95% emulsified and free water separation and 98.7% efficiency at 4 microns, ensuring clean fuel delivery for optimal engine performance.