This replacement air filter fits the engine on a generator. Air filters serve an important purpose in ensuing that dirt, dust, pollen, and other debris does not reach the combustion chamber, where it could cause damage. Instead, the filter traps and collects these contaminants. However, over time, the air filter will slowly clog with trapped debris, which will restrict airflow to the engine. This causes the engine to work harder than normal, consuming additional fuel, reducing performance, and increasing wear on internal components.Periodically, the owner will need to replace the air filter element. The frequency will vary based on use. Users should check their owner's manuals for specific change interval recommendations. To change the air filter, simply open the air filter housing, remove the old air filter, clean any debris that might have accumulated inside the box, and then install the new air filter. Close the housing when finished.This air filter is a genuine OEM part and is designed for specific Generac generators. It is sold individually.