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Weholite is a large diameter, heavy duty plastic pipe, manufactured from High Density Polyethylene (HDPE) resin. This very large plastic pipe system has diameters from 750 to 1500mm and has been designed to discharge large volumes of both surface water and sewage but can also be used as a large volume culvert or holding tank due to its size. It is formed by spirally winding a preformed profile around a heated steel mandrel and welding adjacent sections together to form the pipe length. It has a load capacity of two KNm2.