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If the temperature of your spa reaches 118 degrees F, the thermostat sensor will turn the heater off. Screw the sensor into the No Fault Heater Housing and plug it onto the IQ 2020 control box. Compatible with 1994 to current Hot Spring Highlife, Limelight, and Tiger River spa models.
79005 replaces older style #39204 sensor.
Comes with replacement O-ring for seal.
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