Pre-Filter Air Intake 8 Inch Length 4.75 Inch Top 7.5 Inch Bottom Conical VolantVolant Pre Filters are factory treated using a proprietary hydrophobic process and are manufactured from the same durable polyester material as their race proven regular style. This unique material contains uniform micron openings that will filter out debris . 005 or larger. This pre filter will prevent splashes of water, mud and sand from saturating your air filter. Details: For Use with Filter PN 5111, 5119, and 5150 Type: Conical Filter Base 7. 5