Injen RED Water Repellant Pre-Filter fits X-1021 6in Base/6-7/8in Tall / 5-1/2in Top

Injen Technology?s Hydroshield are designed to enhance the efficiency of any air filter, including Injen?s SuperNano-Web and our 8-Layer oiled cotton gauze air filters. Injen?s Hydroshield is constructed from a proprietary base media and then treated with a hydrophobic water-repellent. Our Hydroshield is UV resistant, can stop contaminants down to .005", is puncture resistant, and has elasticity characteristics which helps the Hydroshield to return to the original shape/position after servicing.