Uadme Greenhouse Window Opener, Automatic Window Opener Solar Heat Sensitive Greenhouse Autovent Vent Opener

Perfect for your greenhouse window‑‑opens and closes your greenhouse window. As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating. Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops. Can be clamped onto or screwed onto your greenhouse frame.