Vapor Pipe Shield is a UL Listed Vapor phase Corrosion Inhibitor delivery system that is fully mechanical with no electrical connections and simply piped directly in-line between the air compressor and the dry pipe valve. Using a technology backed by over forty years of established science, Vapor Pipe Shield is easy to install and maintain, and makes corrosion mitigation in any dry or pre-action fire sprinkler system simple, efficient, and highly cost-effective.