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High Tension Prestressed Galvanized Steel Flexible Metal Tubing Post Tension Flat Duct for Prestressed Concrete, Find Details and Price about Post Tension Flat Duct Post Tension Slab from High Tension Prestressed Galvanized Steel Flexible Metal Tubing Post Tension Flat Duct for Prestressed Concrete - JNFLEX (CHANGZHOU) CO., LTD.