Water stopper/saver. Description. Stop & Go, the automatic water stopper & saver Automatically starts & stops the water flow at the tap. Just remove the old, uneconomical filter from the tap & screw in Stop & Go. If your tap has an external thread, please remove the adapter fixed in Stop & Go before installing. Perfect for filling basins, buckets, sinks & for washing hair, plus thousands of other water-saving uses. Just guide the sensor in vertically & turn it slightly to the right.