The aftermarket temperature sensor from Optimum is a direct replacement for Jandy® AquaLink® temp sensor, but can also be used with Polaris® and Zodiac® control systems. Features: Compatibility: Jandy®, Polaris®, and Zodiac® control systems Replaces: Jandy’s AquaLink RS® Temperature Sensor P/N 7790 (R3002900), 7784, 7786, and 7791 Includes 10K thermistor, 20-foot cord To use as a water temperature sensor: Install the sensor in a 3/8-inch hole in the pipe between the filter pump and filter. To use as an air temperature sensor: Mount the sensor outside the power center out of direct sunlight and away from heat sources. To use as a solar temperature sensor: Fasten the sensor adjacent to solar panels. Specifications: Manufacturer: Optimum Model: TEMPS-J-10K Shipping weight: 1 lb. Watch our video to see how to properly replace the temperature sensor in Jandy systems.