The 4-Pole 3-Wire Temperature Sensor for M-Class ECO-1 is a specialized sensor designed for use with the M-Class ECO-1 Spa Control System, offering reliable and accurate temperature monitoring. With a generous 10’ cord, it allows for flexible placement within spa systems, ensuring optimal temperature control regardless of spa layout. The 4-pin connector ensures precise integration with Hydro-Quip systems, and it plays a vital role in maintaining water temperature and supporting safe, consistent spa operation.