The MAGNUM plastic open manifold consists separate plastic elements which are interconnected by using threaded rods. As a result, the manifold is modular and it is possible to shorten this very simple manifold or to extend. The individual elements are made of a glass fiber-reinforced polyamide plastic, which is very suitable for high but also low temperatures. The elements have a double-walled structure, hence automatically an insulating layer is formed. This makes the manifold particularly suited for heating, but also for cooling. Because of this insulation there is almost no condense on the manifold. This manifold is more and more often used in combination with a heat pump, which heats in the winter and cooling in the summer. Standard features of this manifold are 1 “ball valves, two automatic dehumidifier and 2 fill taps.