Fuel Water Separating Filter. FIlter Size: Long - 4.35" or 110.5mm. Rating: 21 Micron. Ethanol blended fuel absorbs more water and loosens more particulants than regular fuels. Proper filtration is required for every horsepower engine. All filters flow at 90 GPH to feed even the hungriest motor. Thread Pitch: 11/16-16.