Yosoo Replacement Window Opener Auto Vent/Automatic Greenhouse Cylinder for Orbesen, Gardman & B&Q vents This listing is a replacement CYLINDER only, for the full set of auto vent opener you can find it in my shop. Also suitable for Orbesen, Gardman & B&Q vents Non Electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops Important notice:Do not use this opener anywhere the temperature will exceed 50 (122F)