The K&N Airforce pre-cleaner is a foam filter wrap designed to extend service intervals for K&N air filters in very dusty conditions. Red pre-cleaners are oiled after cleaning while gray versions are not; both are made from open-cell foam and are washable with K&N Cleaner or soap and water. The wrap fits over the air filter to provide an additional pre-filter layer and is sized per the listed taper dimensions.
K&N Airforce Pre-Cleaner Round Tapered Red Air Filter Foam Wrap 6in Base ID x 5in Top ID x 9in H