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drainage hollow wall winding pipe extrusion line. 1.application:sewage and drainage pipe . 2.field:construction,urban . 3.CE. Drainage Hollow Wall Winding Pipe Extrusion Line Presently, concrete pipe plays a major role in sewage pipe lines. But because of its chemical instability and leaky joint, it is considered as a main factor in environmental pollution. Casting iron pipes are not ideal ...