... 2chain type corrugator 3vacuum forming , 4water cooling. plastic extruder for double wall corrugated pipe:DWC Pipe Diameter Scope: ID Φ50~ ODΦ250mm. Features ... , Pipe Production Line, Pipe Extrusion Line Pipe Line, Pipe Line, Pipe Extrusion Line,Pipe Production Line, Pipe Machinery, Pipe Machine,Plastic Pipe Line, Plastic Pipe Extrusion Line, Plastic Pipe Machinery, Plastic Pipe ...