Detailed Product Description Feature:Double-wall Corrugated Pipe Production Linedouble wall corrugated pipe extrusion line,plastic corrugated pipe extrusionmachine1, Advantage: It is fully computer controlled, automatic production line ( Φ200-Φ600 ), highly and ... designed by materials, for HDPE, you can choose high efficient single screw extruder. For PVC, you can choose conical twin screw ...