... : 1horizontal structrue 2chain type corrugator 3vacuum forming , 4water cooling. plastic extruder for double wall corrugated pipe:DWC Pipe Diameter Scope: ID Φ50~ OD ... Pipe Machine, Plastic Pipe Line, Plastic Pipe Machine, Plastic Pipe Machinery, Plastic Pipe Production Line, Plastic Pipe Extrusion Line, Plastic Machine, Plastic Machinery, Plastic Production Line, Plastic Extrusion Line ...