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HDPE/PP/PPR/PVC/Pert Plastic Double Structural Hollow Wall Spiral Winding Sewer Corrugated Pipe Tube Extrusion Manufacturing Machine Production Line, Find Details and Price about Pipe Production Line HDPE Pipe Production Line from HDPE/PP/PPR/PVC/Pert Plastic Double Structural Hollow Wall Spiral Winding Sewer Corrugated Pipe Tube Extrusion Manufacturing Machine Production Line - Qingdao Kruto Machinery Co.,Ltd.