The NS Control Thermistor Assembly is a precision temperature sensor designed to maintain optimal water temperature in Watkins spa systems. Specifically engineered for Watkins spa heaters, including Hot Spring, Tiger River, and Limelight spas, this sensor works in conjunction with the IQ 2020 control system to ensure consistent and accurate heating. Its 4-pin Molex connector and 5/8” threaded fitting with O-ring allow for secure electrical connection and quick, leak-free installation.