The Resideo VC8711ZZ11 SPST 2-Position Actuator with End Switch is a control device designed to operate zone valves in HVAC systems. It works by opening or closing the valve in response to an electrical signal, while the end switch confirms valve position to the control system. Commonly used in hydronic heating systems, fan coil units, and zone applications, it ensures accurate flow control. Its reliable operation enhances energy efficiency, improves system coordination, and supports consistent temperature regulation.