Check the listing for details. 42001-0063S High Limit Switch Replacement Pool/Spa Heater. Condition: New. Listed at 10.45 USD. Upgrade your Pentair pool or spa heater with our high-quality replacement sensors designed specifically for the Pentair 42001-0063S High Limit Switch. Crafted with precision and durability in mind, these sensors ensure accurate temperature regulation, providing a seamless heating experience for your pool or spa. Designed as a wholesale solution, our replacement sensors offer affordability without compromising on quality. 12-Month Warranty by Wholesale Sensors, a USA Manufacturer: Rest easy knowing your purchase is protected by our 12-month warranty. Wholesale Sensors, a trusted USA manufacturer, takes full responsibility for ensuring the quality and performance of our product, offering you added peace of mind with every purchase.Replacement for Pentair 42001-0063S High Limit Switch for Pool/Spa HeaterCompatible with Pentair MasterTemp (All Models) & Max-E-Therm - Models SR200, SR333, SR400Built to withstand the rigors of pool and spa environments, our sensors are made with high-quality materials for long-lasting performance. Maintain precise temperature control for your pool or spa with our replacement sensors, ensuring a comfortable and enjoyable experience.42001-0063S sensor detects when water temperature exceeds safe level and automatically opens heat exchanger outlet. High Limit Switch (135°F)Crafted to meet and exceed industry standards, these sensors provide accurate high limit control, promoting efficient and safe heating for your pool or spa.