Abstract: A compact, portable, radio-controlled on/off valve for use with a garden hose has low energy consumption by using a water-powered motor for driving the valve into open and closed positions. The on/off valve has a pilot device for starting water flow through the water-powered motor. A low-power local electrical energy source, such as a battery pack, powers the pilot device and a receiver for receiving control signals. Upon receiving a control signal, the pilot device is energized briefly to start water flow through the water-powered motor. The water-powered motor then moves the valve from a closed position to an open position, or from an open position to a closed position.