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70mm Galvanzied Smooth Flat Duct Post Tension Corrugated Bellows Spiral Pipes for Constructions, Find Details and Price about Post Tension Flat Duct Post Tension Corrugated Bellows from 70mm Galvanzied Smooth Flat Duct Post Tension Corrugated Bellows Spiral Pipes for Constructions - JNFLEX (CHANGZHOU) CO., LTD.