Photo 1 of NelsMich 42002-0024S Stack Flue Sensor for Pen-tair Mastertemp 400,250,125,300 Spa Heater Electrical Systems Model SR200, SR333, SR400, Includes High Limit Switch & Heater Thermistor Replacement.

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Photo 1 of NelsMich 42002-0024S Stack Flue Sensor for Pen-tair Mastertemp 400,250,125,300 Spa Heater Electrical Systems Model SR200, SR333, SR400, Includes High Limit Switch & Heater Thermistor Replacement.Photo 2 of NelsMich 42002-0024S Stack Flue Sensor for Pen-tair Mastertemp 400,250,125,300 Spa Heater Electrical Systems Model SR200, SR333, SR400, Includes High Limit Switch & Heater Thermistor Replacement.