Double Springs Window Opener-Black Color

DOUBLE SPRING — Dual Spring Solar Vent Opener with Stronger Force, up to 15kgs. If 1 Set is still not enough for your window, you could use two or more window openers together.
PREMIUM QUALITY — The window opener is made of high quality metal . Durable and rust resistant in damp environments Long service life.
EASY TO INSTALL– Easy to fit onto your Greenhouse vent or window using supplied screws and clamps or your own fasteners into pre-punched holes. If you have any questions, please don’t hesitate to contact with us.
NO ELECTRICITY NEEDED — Uses solar energy, open or close the greenhouse vents as temperature rises or drops and clamps to greenhouse bars.
SUITABLE FOR MOST GREENHOUSES — This opener will automatically open and shut your greenhouse window to maintain the best growing temperature and preventing your greenhouse from overheating.