... core pipe has the features of high hardness, high tenacity, corrosion resistance and long life. And it also has extrusion sign ... a new cable hose succeed to PVC plant pipe, double-wall corrugated pipe and multi-pipe. At present, it is widely used for ... Integrated with three-layer co-extrusion,cooling and finalizing the design,drawing and winding,the production line is characterized by high automaticity ...