Aluminum alloy automatic greenhouse window opener cylinder designed for reliable, lowmaintenance ventilation control. Key benefits Durable and rustresistant: Made from quality aluminum alloy for long service life in humid greenhouse environments. Saves time and cost: the cylinder only when the automatic window opener stops working; no need to the entire vent opener. Automatic temperature control: Begins to open around 15 C and reaches full opening at around 25 C, helping maintain stable growing conditions. Simple adjustment: Finetune vent opening by screwing the piston in or out for small changes to the opening range. Tool installation: Clamps to greenhouse frames so you can install without drilling holes; designed to resist wind gusts and provide stable operation. Features and compatibility Function: Acts as the thermal cylinder for greenhouse automatic window openers, converting temperature changes into linear motion to open and close vents. Material: quality aluminum alloy for corrosion resistance and durability in humid conditions. Performance: Predictable thermal response between approximately 15 C and 25 C with adjustable piston travel for precise ventilation control. Compatibility: Intended as a replacement cylinder for standard greenhouse automatic vent openers; suitable where a similar thermal actuator is required. Typical use scenarios Hobby greenhouse: Maintain proper air exchange for seedlings and potted plants by installing a reliable automatic vent cylinder. Commercial nursery benching: Automate vent control to reduce manual monitoring and protect plants from overheating during warm days. Cold frame or cloche ventilation: Provide temperaturedriven vent opening and closing without electrical power or timers. What to expect A durable aluminum alloy cylinder that reinstates automatic operation when the original unit fails. Easy installation and adjustment using simple clamping and piston screw adjustments. Predictable opening behavior across the specified temperature range to support healthier plant environments. Note The cylinder is intended to the thermal actuator portion of greenhouse automatic window openers. Confirm physical compatibility with your existing vent hardware before installation.