Watts 81019061 IntelliStation Temperature Sensor is a monitoring component designed for compatible Watts IntelliStation hydronic HVAC systems. It detects water or system temperature and sends accurate readings to the control system for proper operation and temperature regulation. Used with hydronic heating and cooling equipment, this sensor helps the IntelliStation maintain desired op... https://www.partshnc.com/81019061-watts-intellistation-temperature-sensor