The Louvre Window Opener Spare Cylinder Can Be Used To Automatically Open Our Greenhouse Louvre Window Kit & Many Other Popular Models; & With A Temperature Range Between 15c (59f) & 25c (77f), You Can Be Sure The Opener Will Open & Close Your Louvre Window When Appropriate. relatively Simple To Fit, The Louvre Window Opener Is Supplied With Fully Illustrated Mounting Instructions & Information On Setting The Piston, Filled With Mineral Wax, Which Opens The Window. Other Louvre Window Opener Features Include A Manual Override Function & One Year guarantee.louvre Window Opener Automatically Opens Greenhouse Louvre Windowsfits Our Our Greenhouse Louvre Window Kit & Many Other Popular Modelstemperature Sensitive Wax Inside Piston Opens & Closes Windowopener Can Be Set To Open Between 15c (59f) & 25c (77f)supplied With Full Installation & Setting Instructionsmanual Override 1 Year Guaranteefully Adjustable