A Taco water and gas shut-off valve is a simple, inexpensive and reliable to way to guard against disastrous water problems that can arise when water heaters develop a leak. Taco’s Wags valve, ideal for new or existing water heaters, is totally mechanical and can be installed with or without an electric harness. If a leak occurs, an internal water-soluble fiber element dissolves, releasing a powerful, spring-loaded piston that closes flow of water to the tank. With the addition of a wiring harness for gas-fired appliances, this action will also break a fuse to shut off the water heater’s gas supply. The valve’s action is based on fiber element technology developed for the British Royal Air Force to inflate life jackets automatically. www.wagsvalve.com.