MPN: 1034BLK |RPI: 2701095. Notes: Injen Black Water Repellant Pre-Filter fits X-1015 X-1018 6.75in Base/5inTall/5inTopInjen 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.