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16mm 20mm 25mm 32mm PVC Conduit Electrical Pipe Making Twin Screw Extruder/Extrusion Machine Production Line with Belling Machine, Find Details and Price about PVC Electrical Pipe Production Line PVC Pipe Production Line from 16mm 20mm 25mm 32mm PVC Conduit Electrical Pipe Making Twin Screw Extruder/Extrusion Machine Production Line with Belling Machine - Zhangjiagang Friend Machinery Co., Ltd.