a water meter and rpz in by pass line fireprotection system supply main detects ... leaks and unauthorized use of water fire sprinkler lines all cross-connections ... cookers tanks vats lawn sprinklers fire sprinkler lines commercial pools fire ... supply lines at the meter residential fire sprinkler systems double check detector ... continuous pressure 6 above flood rim fireprotection system supply main detects ... atmospheric port above fixture rim protection washing machines against back siphonage ... ball type test cocks againstsupplied protection chemical planting tanks backsiphonage ...