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Sn4 Sn8 Plastic Culvert HDPE Double Wall Corrugated (DWC) Sewage Spiral Pipe, Find Details and Price about Plastic Tube Water Tube from Sn4 Sn8 Plastic Culvert HDPE Double Wall Corrugated (DWC) Sewage Spiral Pipe - Yunnan Hengcai Pipeline Co., Ltd.