Replacement mastertemp Stack Flue 42002-0024S for Pool and Spa Heater Electrical Systems (2-Pack) Designed specifically for Mastertemp Stack Flue 42002-0024S, Built with quality materials, our sensors are durable and designed to withstand the harsh conditions of pool and spa environments, ensuring long-lasting performance. Operating Temperature: -20°C to 105°C Accuracy: +/- 3% Environmental Rating: IP65 Elevate the efficiency and safety of your pool or spa heater with the 42002-0024S Stack Flue Sensor Replacement. Designed to seamlessly integrate into your heater's electrical system, this sensor ensures accurate monitoring of flue stack temperatures, essential for maintaining optimal combustion and preventing overheating. Crafted with precision engineering and durable materials, the 42002-0024S sensor offers reliability and longevity, even in demanding pool and spa environments. Its direct replacement design facilitates hassle-free installation, allowing you to quickly and easily enhance the performance of your heater without extensive downtime. With the 42002-0024S Stack Flue Sensor, you can trust that your heater will operate at peak efficiency while prioritizing safety. Ensure consistent and reliable heating for your pool or spa, and enjoy peace of mind knowing that your equipment is equipped with top-quality components.