Size: For 6mm or 8mm inner diameter hose. Function: Our fuel filters can filter impurities and deposits from gasoline, reduce wear and tear on parts and protect the engine. Transparent Design: The fuel filter has a transparent plastic shell, which allows you to see if gas is flowing through the filter. Wide Compatibility: The filters can be used for tractors, cars, trucks, motorcycles, RVs and any gasoline engine, universal plastic fuel filters. Application: Fits many small engines/lawns or gardens.