The Hi-Limit Sensor for M-Class/S-Class is a critical safety device for M-Class and S-Class spa systems, designed to protect your spa from overheating. This sensor monitors water temperature and interrupts power to the heater if unsafe conditions are detected, helping prevent equipment damage and safety hazards. With a long 72” cable, it's versatile and ideal for a variety of spa configurations. Its 2-pin black connector ensures easy plug-and-play integration with compatible control systems, including Gecko, Hydro-Quip, and EasyPak setups.