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PT 70 Slab Prestress Flat Duct for Large-Diameter Concrete Building-Embedded-Metal Duct, Find Details and Price about Post Tension Flat Duct Post Tension Slab from PT 70 Slab Prestress Flat Duct for Large-Diameter Concrete Building-Embedded-Metal Duct - JNFLEX (CHANGZHOU) CO., LTD.