Nikou Greenhouse automatic window opener - Greenhouse Window Opener Cylinder Replacement Temperature Sensor Solar Sensitive Automatic Greenhouse Window Openers

This is a replacement cylinder for automatic window opener. High sensitive, automatic respond to weather changes, so you don't need to stay near the greenhouse. Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops. Greenhouse window automatic roof vent opener is great for most greenhouse to open or close window automatically. Time and labor saving, also can supply a better temperature condition of plant's growth.