Replacement Window Opener, Automatic, Hydraulic Cylinder. Features: Automatic Window Opener Temperature Range :It Will Be Close at the Greenhouse Temperature Less Than 15.it Will Be Open at the Greenhouse Temperature More Than 25. Greenhouse Window Opener Maximum Opening Weight 7kg/15lb 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) This Products Need to Be Refrigerated Before Use It. Specifications: Model Number: Replacement Greenhouse Window Opener Cylinder Material: Aluminum Alloy Surface Finishing: None. We are an international based seller that will ship your order from abroad, please at least a minimum 14 working days for delivery right now due to the ongoing delays in shipments globally.