Airdog Fuel Filter, 2-Micron, Part # FF100-2
The AirDog systems come with the 2 Micron filter equipped from the factory. The 2 Micron filter provides the best filtration, while the 10 micron filter (FF100-10) provides the best flow. The 10 micron filter is only recommended for extreme cold weather use to allow the fuel to flow through the filter more freely.
The fuel filter has a estimated life of 30-40,000 miles while the water separator is a lifetime "flush" filter, and only needs to be replaced if damaged.