This is a water repellent Pre filter thats is a must have for bad condition from Wet to dusty weather.  Helps keeps water and dust out.. A real must have for any pit bike rider.
Racers and engine builders 
were experiencing loss of horsepower and engine damage due to sand, dirt, and other debris prematurely packing (clogging) the filter and often passing through the filter into the engine. Filters loading up with dirt meant loss of horsepower and in many cases loss of a race. Race crews were noticing severe engine damage due to dirt entering into the engine. Thus, a true need for a product designed to keep out additional dirt without interfering with airflow was necessary.
Top dia 4" Base dia 4" Height 4"