Sierra Marine 18-7866 Fuel Water Separator Filter.Fuel/Water Separator Filter fits all high HP 2-Stroke and 4-Stroke Yamaha enginesFeatures: Filter Size: High Capacity - 6" or 152.4mm Rating: 10 Micron Thread Pitch: 11/16-16 Flow Rate: 90 GPH Ethanol blended fuel absorbs more water and loosens more particulants than regular fuels Sierra&';s 10 micron filters are over 90% efficient at removing particles as small as 10 micron