Check the listing for details. 78969 Hi-Limit Thermistor. Condition: New. Listed at 30.54 USD. High-Limit Thermistor This part is a replacement thermistor for select Hot Spring hot tubs and Endless Pool models. 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. Make Model Date Range Hot Spring Grandee 1997-2003 Hot Spring Jetsetter 1997-2000 Hot Spring Prodigy 1997-2000 Hot Spring Sovereign 1997-2000 Hot Spring Classic 1997-2000 Hot Spring Landmark 1997-2000 Tiger River Bengal 1997-2000 Tiger River Siberian 1997-2000 Tiger River Sumatran 1997-2000 Tiger River Tondi 1995-1996 Tiger River Khyber 1995-1996 Tiger River Manora 1995-1996 Tiger River Tondi PH 220 1996 Tiger River Manora MH 220 1996