Features: Actuator + valve: The electric valve consists of two parts: the actuator and the valve. The actuator features compact size, high torque, and long service life. It supports bidirectional control to meet various requirements. High-quality valve blade: The valve blade is made from high-quality aluminum plate with stamping molding, equipped with a silicone sealing ring for excellent airtightness, wear resistance, and corrosion resistance, ensuring stable and reliable performance. Motor: The round valve uses a high-quality motor for smooth and reliable operation with low failure rate. The valve body is constructed with polished stainless steel, offering corrosion resistance and a premium appearance. Compatible with temperature controller: Can be used with a range of thermostats for automatic on/off control, enabling effective environmental regulation with energy efficiency, comfort, and quiet operation. HVAC Duct Valve / Electric Duct Damper / Motorized Damper 125MM 220V Both valve opening and closing require power; the actuator automatically shuts off after completing an action. Operation time is approximately 10 seconds. This damper is suitable for controlling airflow from full flow to complete shut-off. The damper is constructed with polished stainless steel and includes an aluminum valve plate. It can work with a thermostat for automatic open and close operation. Color: Silver Material: Stainless steel Size: Height: 19mm Outside diameter: 125mm Package Contents: 1 x Electric Valve Only the above package content is included; other items are not part of the package. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement allows an error of +/- 1-3cm.