Shaft made by rotational moulding PE-HD lid (black) can be loaded up to 150kg, accessible Connecting pipes DA 32 or DA 40 SDR 11 (flow, return) to weld the probe pipes by using an electro-welding fitting or press fitting 2 connecting pipes DA 40-110, depending on size (flow and return of heat pump) to weld the pipes by using an electro-welding fitting or press fitting special designs on request