About This

• Replacement Cylinder Only: Designed as a greenhouse window opener replacement cylinder only, suitable when your automatic vent no longer opens or closes properly and the original cylinder needs renewal
• Automatic Temperature Control Range: Built-in temperature sensing helps open and close greenhouse vents automatically within approximately 16C to 26C (60F to 78F) to support healthier plant growing conditions
• Solar Powered Operation: This non-electric vent opener cylinder uses solar heat response to lift or lower vents as temperatures rise or fall, helping reduce greenhouse overheating without wiring
• Compatible with Single or Double Spring Types: Suitable for single spring or double spring window openers and compatible with most greenhouse shutter opener styles, making replacement simple and practical
• Durable Material with Important Usage Instructions: Made of quality material and easy to use; refrigerate before use, do not dismantle or expose above 50C (122F), and note that actual color may vary slightly due to display differences
• Temperature Sensing Technology: Features automatic temperature-responsive mechanism that maintains optimal growing temperature by adjusting vent position based on ambient heat levels throughout the day
• Energy-Free Greenhouse Climate Management: Operates without electricity or batteries by utilizing thermal expansion principles, providing reliable ventilation control while reducing energy costs and environmental impact