PE Large Diameter Winding Pipe Production Line There are four hardness degree,and the Max can attach 16KN/m2.It is suitable for the sour or alkali liquid below 10%.This kind of pipes offer corrosion resistance,light weight,long serive life(50years),easy fix ,etc,that are widely used as sewer in highway,municipal construction,uptown,playground,square,mine,bridge,and agriculture etc.