Abstract: The present invention is directed toward an anti-tamper system for fire hydrants that prevents intentional introduction of contaminates into the water system as well as prevents unauthorized removal of water from the water system while still providing easy access to pressurized water by authorized personnel. The system is constructed and arranged to prevent the rotation of the valve stem and/or the nozzle cap(s) by unauthorized users. The system replaces or modifies the valve stem to include at least one aperture therethrough. A replacement nozzle cap is also provided. The nozzle cap includes a centrally located locking bar that cooperates with both the valve stem and the nozzle cap to prevent rotation thereof by unauthorized persons. A release tool is provided to remove or retract the locking bar from the valve stem, to allow valve operation, while simultaneously allowing rotation of the nozzle cap to allow removal thereof from the outlet port.

Abstract: A system connectable to a water line for controlling the flow of water includes an underground housing, a shut-off mechanism disposed within the housing and connected to the water lines, and a controlling mechanism including a wand for sending a signal to the shut-off mechanism and thereby open and close the system. The shut-off mechanism includes a motor, an actuator interface, and a drive shaft operably connected to each other wherein the drive shaft rotates based upon the signal from the wand so that water flow can be adjusted as desired by an operator. The controlling mechanism includes an antenna and transceiver for communicating with the wand. The actuator interface is coupled to the antenna for processing and communicating a signal received from the wand and transmitting same to the motor and drive shaft.