FloodStop Water Heater Auto-Shutoff Valve, FS3/4NPT, V4 Controller, Water Damage Prevention PREVENT WATER DAMAGES - This automatic shut off valve will trigger when a leak is detected from your water heater, potentially preventing 200+ gallons of water leaking into your home. EASY TO INSTALL - The FloodStop valve is installed between the water heater and the manual shutoff valve; can be installed in fifteen minutes. SENSOR AT BASE OF HEATER - The sensor part of this system is placed at the base of the water heater. As long as the sensor stays dry, the valve will stay open permitting water to flow through to the heater. IMMEDIATE SHUTDOWN - Once the leak sensor at the base of the heator senses moisture, the valve will immediately close off all water flow and sound alarms. CERTIFIED LEAD FREE - Certified lead free under S. 3874, AB1953 with a One Year Manufacturer's Warranty.