Floodstop 1 Inch NPT Water Valve System for Water Heater, Softener, Etc. Floodstop 1 Inch NPT automatic water valve system shuts off water to water heaters , water softeners , water conditioners or other water devices with a 1 inch water line. Do-It-Yourself or use a plumber. The one inch full port brass water valve meets all USA drinking water requirements for lead free water valves. Uses 4 AA batteries if AC power is not nearby. This water leak detection system shuts off water only to the protected appliance. A damp moisture sensor signals the unit, the water valve closes, the water is shut off and an alarm sounds. Power is supplied by an AC adapter/transformer or batteries. Output contacts enable the controller to connect with alarm, home automation or auto-dialer systems if desired. Installation is easy, usually within fifteen minutes. Prevent water heaters from flooding your property. FloodStop FS 1.00-NPT-V4 One Inch Water Valve System Components: Motorized Full-Port Ball Valve(1.00 inch NPT pipe threaded) Control Unit with Battery Backup (4 AA batteries, not included). AC Power Adapter (or use 4 X AA Batteries as Primary Power Source) if a nearby AC outlet is not available. Water/Leak Sensor (1.25" X 7.5") AC Adapter Cord: 6 Ft. Wire Length from the Controller to the Valve: About 30 Inches Long. Output Contact Wires (2) Installation Guide (find the link in right margin of this webpage) One Year Limited Manufacturer Warranty.