Poly Rok® artifi cial rocks are ASSE-certifi ed enclosures designed for performance and aesthetic impact. The Poly Rok is designed to protect your backfl ow preventer, vacuum breaker, air release valve or pump from vandalism, freezing or unsightliness. They are available with or without insulation or heat. A natural look blends in with the environment. Visit our website for details and to scan our CAD library.