FloLogic

The FloLogic Automatic Water Shutoff System
Described by Popular Science as “the circuit breaker for your home’s plumbing system,” the FloLogic System™ is an automatic water shutoff system that constantly monitors all water coming into the home and detects any unusual flow. If water flow exceeds a preset limit, the System automatically shuts off the water and sounds an alarm. The System does all of this from a single point in the water main, serving as a first line of defense against water damage.
The FloLogic System consists of a flow sensor and user interface that controls a motor-driven ball valve. The System can also be connected to any home security system, alerting your monitoring service when a leak is detected.
In the “Home” mode, the System is pre-programmed to allow up to 30 minutes of uninterrupted water flow before the shutoff valve is activated. The “Away” mode allows 30 seconds of uninterrupted flow. Both modes can easily be reprogrammed to correspond with your personal water use patterns. http://www.flologic.com/