A leak detection and shut-off apparatus for preventing damage from leaking hot water tanks. The invention features a unique three-layered sensor that completes encases the hot water tank thus detecting the occurrence of leaks anywhere on the tank. Circuitry controls the sensor that provides for accurate...http://www.google.de/patents/US5334973?utm_source=gb-gplus-sharePatent US5334973 - Leak detection and shut-off apparatus
