Want to make sure your fuel is clean? Yes, of course, we all do. This is the simplest answer. Here are five inline fuel filters to clean up your gas. There are hundreds of uses for these as they are applicable just about anywhere you can put one. We keep them in the shop and use them consantly, even in combination with a factory fuel filter. These straight filters are 45x30mm to be used with 6 or 8mm hose. A similar looking, but inferior knock-off will cost you $5 at your local parts store. You get 5!