It easily installs on any automatic irrigation system, then shuts sprinklers off in a storm and keeps them off, automatically compensating for the amount of rainfall that occurred. Disks absorb water and expand proportionally to the amount of rain that fell (e.g., a small cloudburst would result in little absorption, a 6" thunderstorm would lead to more absorption and expansion). As the moisture-laden disks expand, they eventually activate a switch that interrupts the circuit from the controller to the solenoid valves. Once dry, they contract and release the switch. The rain sensor automatically resets without ever affecting your controller. There’s no better way to ensure that a system isn’t watering when it isn’t necessary.

• Adjustable rain sensitivity from 1/8 In. to 1 In. of precipitation
• Hygroscopic discs absorb water to
• Works with most existing sprinkler systems
• 30 feet of connection wire included
• Mounting options: threaded, slip and rain gutter, or flat surface

  5 year warranty.