The 6600-110 Sundance Hi-Limit Sensor Box-End Connectors are designed to ensure the safe and efficient operation of your Sundance spa system. This hi-limit sensor protects the spa heater from overheating, shutting off power if the water temperature exceeds a preset limit. With a 7’ cable and ¼” bulb size, the sensor is compatible with a range of Sundance systems, including the 400, 600, 600-S, 600-DX, 800, 1992 Suncoast Systems with High Flow Heater, and 1994-98 Suntub Systems. The box-end connectors ensure secure and reliable connections, making installation quick and easy.