150 - 600mm twinwall pipes
This is the most widely used range of structured wall pipe which has diameters between 150 and 600mm. These are generally used as surface drainage systems rather than water holding or culvert pipes and can be buried to depths of 10 metres and are manufactured from High Density Polyethylene (HDPE). The pipes are formed by a twin extrusion process in which two layers are simultaneously extruded, giving the pipe a corrugated outer wall and smooth inner wall, resulting in a pipe of greater strength and long life expectancy.
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