1.【Function】Greenhouse automatic ventilation opening cylinder can automatically open or close the window according to temperature changes.2.【Plant cultivation】With the function of automatic ventilation. Automatic opening and closing, our automatic window opener cylinder ensures the optimal growth temperature in the greenhouse.3.【Energy Saving】Without electricity or solar energy, this hydraulic greenhouse jack opener is environmentally friendly and works normally in different weather.4.【Premium Material】Made of durable ABS, aluminum alloy and stainless steel, heat-resistant, heat and corrosion resistant, can be reused for years.5.【Easy to install】It can be firmly mounted on the greenhouse window by clamps or screws.