The Trane SWT03334 Thermal Sensor Flow Switch is a 24V AC/DC HVAC control component with a 15 cm sensor designed to monitor fluid flow in compatible heating and cooling systems. It detects changes in flow conditions and sends an electrical signal to help regulate equipment operation and protect system components. Commonly used in compatible chillers, heat pumps, and hydronic HVAC syst... https://www.partshnc.com/trane-swt03334-thermal-sensor-flow-switch-15-cm-24v-ac-dc