Pentair Mastertemp / Max-E-Therm Pool Heater Repair Kit — Stack Flue Sensor, Thermistor, Pressure, Gas Shutoff & High Limit Switch — Replaces 42002-0024S, 42001-0060S, 42001-0053S, 42002-0025S, 42001-0063S

Compatibility: Designed for Pentair Mastertemp and Max-E-Therm pool heaters. Kit contents: 42002-0024S Stack Flue Sensor; 42001-0060S (3902) Pressure Switch; 42001-0053S Thermistor Sensor; 42002-0025S Gas Shutoff Switch; 42001-0063S High Limit Switch. Durability: Manufactured from high-quality materials to resist corrosion and provide long-lasting performance. These components are built to remain stable in high-temperature and humid environments, ensuring dependable operation for your pool or spa. Performance features: The High Limit Switch senses when water temperature rises above a safe threshold and can automatically open the heat exchanger outlet. The Thermistor Sensor has low thermal inertia, allowing the heater’s control system to fine-tune heating power to maintain the set temperature. The Stack Flue Sensor prevents flue gas output from exceeding 500 degrees F, delivering reliable and stable monitoring. Installation: All parts are direct replacements for the original components, making installation straightforward so you can quickly return the heater to peak condition.