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Polypropylene Thermal Insulation Pipe for Hot Water and Heating Carbon Steel Seam Butt Welding Pipe, Find Details and Price about District Energy Pre Insulated Pipe Thermal Insulation for PVC Pipes from Polypropylene Thermal Insulation Pipe for Hot Water and Heating Carbon Steel Seam Butt Welding Pipe - Shandong Donghong Pipe Industry Co., Ltd.