The pre-filter is made with 1/8 inch thick ABS plastic for durability and cankeep particles of debris such as rubber, dirt, sand and grain chaff from getting into and clogging the pleats of the air filter element. It is made of a proprietary polyester mesh with uniform micron openings and treated with a hydrophobic water repellant process.

The pre-filter can catch particles as small as .005 inches and is built to fit over the under- the-hood filter as well as the cabin filters and canisters. Pre-filters can be used over and over again as they are easily cleaned with soap and water.