DEAR BARRY: I've heard of a device that automatically turns off your water main if there is a leak in your home. What can you tell me about this device? Is it really worthwhile? --Terry DEAR TERRY: The product you have heard about is called the "Leak Defense System" manufactured by Sentinel Hydrosolutions. It consists of an automatic control valve that is installed in your water main and connected to an electronic control module in your home. This system electronically monitors water flow through the main line. If there is a slow, continuous flow for an extended period of time, or if there is a sudden, major flow all at once, the system automatically turns off the water supply to your home. Some might regard this as an unnecessary defense against a highly unlikely occur...
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