Backflow devices that are installed above ground can be protected from theft by installing either an artificial rock. backflow enclosure or gorilla cage. The rocks are designed to cover your backflow and also make it blend into the landscaping. The backflow enclosure is designed to discourage the thief from a quick job. The gorilla cage is effective because it is bolted down to a concrete pad making for strong unitized construction. All of these products can be purchased at Sprinkler Warehouse.