Description: Ingenious temperature-sensitive automatic vent opener cylinder can adjust mperature in 15-25 (60-77) to maintain the best growing temperature in greenhouse. Heat sensitive cylinder can work as the greenhouse thermostat, thus there is no need for electrical power supply.Not Including Automatic Vent Opener Features: Temperature SensitiveAutomatic vent opener cylinder with temperature sensitive part can help you to maintain the best growing temperature and preventing your greenhouse from overheating. Stainless Steel ConstructionDurable and rust-proof stainless steel windows opener cylinder for last long time use. Weather ResistantElongated aluminum cylinder with weather resistant and corrosion resistant can show you a better perforance. Wide ApplicabilityGreenhouse windows opener cylinder can be replaceed manually and easy to install, fit for most of aluminum frame greenhouse. Ecological CylinderNo need any electricity in your greenhouse, the window opener cylinder will be very environmental and ecological. Specifications: Material: Aluminium, Stainless Steel Color: Black Star open at: 15-25 (60-77) Fully open at: 30/86 Length: 33.8cm / 13.3inch Package Size: 34*1*1cm / 13.38*0.39*0.39inch Package Weight: 140g / 0.3lb Package List: 1 * Cylinder Note: Do not heat to more than 50(122). Do not dismantle the cylinder.