... 2) High heat resistance, aging resistance, environmental stress pipe production line,ppr p Features:1) Diameter: 12 - 630mm ... 100, 120, 150, 200 and 250mm5) Different auxiliary machines are combined6) Length / diameter ratio can be changed ... pipes productionpipe production line,ppr pipe production line,plastic machine PE and PPR Pipe Production Line,pipe production line,ppr pipe production line,plastic ...