Teu FI PP-R CT 20x1/2"x20 Teu FI PP-R CT 20x1/2"x20 is a type of polypropylene composite pipe used for plumbing and other water-related applications. It is a combination of polypropylene and a special layer of glass fiber, which makes it strong, durable, and corrosion-resistant. The 20x1/2"x20 designation indicates the size of the pipe; it has an outside diameter of 20mm, an inside diameter of 1/2", and a wall thickness of 20mm. This type of pipe is typically used for hot and cold water supply lines, as well as for drainage systems.