Cot Rehau Rautitan Ø25-45° Rehau Rautitan Ø25-45° is a flexible plastic pipe system designed for hot and cold water supply in residential, commercial and industrial buildings. The system is made up of an inner pipe made from polyethylene, which is surrounded by a protective layer of polyethylene foam. The pipes are connected using compression fittings, which allow for flexibility and ease of installation. The system is designed to provide an efficient and reliable water supply, and is available in several sizes to suit different needs.