Features: brand new and high quality The damper is suitable for controlling the air volume from full flow to shut-off. The damper is made of plastic and is equipped with a plastic tube. It can work with a thermostat to automatically turn on and off. The air tightness is good, the tightness is as high as 98 percent , and the adjustment performance is good. The for valve body and blades are made of new materials, odorless, pollution-free, wear-resistant and corrosion-resistant, and easy to disassemble. Specifications: Material: PVC Weight: 538g Size: As picture shows Interface: DN75 or DN110 or DN160 Voltage: DC12V or 220V or AC24V or DC24V Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Motorized Damper