UNIVERSAL FIT FOR HEATERS: This replacement kit includes the 42002-0024S Stack Flue Sensor, 42001-0063S High Limit Switch, and 42001-0053S Heater Thermistor, ensuring compatibility with Sta-, MasterTemp, and Max-E- pool and spa heaters. PREMIUM CONSTRUCTION: Crafted from rust-free metal, our sensors and thermistors offer reliable performance. The 42002-0024S sensor monitors flue gas temperatures up to 500F, while the 42001-0053S operates effectively from -20C to 80C. EASY DIY INSTALLATION: Save on costly professional fees with our user-friendly replacement parts. COMPLETE REPLACEMENT SET: Each package contains 1 piece each of 42001-0063S, 42001-0053S, and 42002-0024S, providing a full set of replacements to enhance the safety and efficiency of your heating system. Color: Photo Color Material: Metal Package Contents: 1 x Pool Heater Repair Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.