FlareTubes from Advancing Alternatives have multiple uses in greenhouses. They are durable in all weather and won’t peel, rust, crack or warp. They easily connect to another tube or existing structural members including walls and floors. The FlareTubes are made of special 1½ inch-by-1¾ inch rectangular tube aluminum alloy with 1/8-inch thick tube walls. Available in 8-, 10-, 12-, 14- and 16-foot lengths.