... operation, 4.relaible continuous production HDPE,MDPE Diameter Water Supply,Gas Supply Pipe Extrusion Production LineThe HDPE,MDPE Large Diameter Wter Supply ... control system,extruder,die head,sizing and cooling system,hauling machine,planet cutting device,and turning rack.The extruder adopts enforced ... -710diameter:250-710SJ180/30800-1400750SJ45/28 JINGCHENG large calibre PE water and gas pipe machine