Condition: 100% new In order to get the normal functioning of the engine, there must be a lot of inhalation. If the harmful substances in the air (dust, resin, aluminum, iron acidification, etc.) is sucked in the engine, the cylinder, piston assembly increase the burden, which make them wear too much, so that the engine oil is , cause more substantial wear, lead to deterioration in engine performance and shorten engine life Air filter, like our nose, is the first "hurdle"of the air entering the engine, its role is to filter out sand in the air as well as some suspended particles to that the engine is working properly, prevent engine wear. Meanwhile air filter also has a mute function Suitable for: & Stratton 491588 491588s 5043 5043D 399959 119-1909, Weight: 0.66579603124 pounds, Manufacturer: Kueohse