This is a replacement cylinder for automatic window opener. Can be clipped or screwed onto your greenhouse frame.
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.
Great for most greenhouse to open or close window automatically. This is not a complete vent - it's just a black alternative to the wax bath. This is the cylinder of the automatic greenhouse window opener manufactured by Orbesen. Suitable for Orbesen, Jempvent, Gardman and B&Q vents.
Time and labor saving, also can supply a better temperature condition of plant's growth.
