... HDPE,MDPE Diameter Water Supply,Gas Supply Pipe Extrusion Production LineThe HDPE,MDPE Large Diameter Wter Supply Pipe,Gas Supply Pipe Extrsion Preoduction Line developed by our company ... basket type die head or spiral split type pipe extrusion compounding die head,which has characteristics of convenient ... /28 HDPE,MDPE Large Diameter Water Supply Pipe,Gas Supply Pipe Extrusion Production Line