This fuel filter is designed to remove small particles up to 10 microns from gravityfed tanks It also works on pumps with a max flow rate of under 20 Gallons Per Minute The inlet and outlet are 1 BPT British Pipe Threads The element has 366 square inches of filter surface for max filtration and durability This is not recommended for aviation fuel, race fuel, or gasoline containing more than 10 ethanol