The Resideo V8043B1027 Zone Valve is a high-efficiency 3/4" valve used to control water flow in HVAC systems. This valve regulates temperature in heating systems by directing the flow to different zones. It operates at 24V and has a two-position actuator control signal. https://www.partshnc.com/v8043b1027-resideo-34-swt-24v-no-35cv-zone-vlv