... LineThe HDPE,MDPE Large Diameter Wter Supply Pipe,Gas Supply Pipe Extrsion Preoduction Line developed by our company ... ,environmental stress cracking resistance,and good thermal fusion welding property.The product has become the first choice ... ,extruder,die head,sizing and cooling system,hauling machine,planet cutting device,and turning rack.The extruder ... large calibre PE water and gas pipe machine