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PT 90 Slab Prestressed Flat Duct for Concrete Building Embedded Metal Duct ISO9001, Find Details and Price about Pre-Stressed Metal Corrugated Pipe Post Tension Flat Duct from PT 90 Slab Prestressed Flat Duct for Concrete Building Embedded Metal Duct ISO9001 - JNFLEX (CHANGZHOU) CO., LTD.