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Anti-Corrosion Worm Gear Flanged Butterfly Valve Pn16 Ductile Iron EPDM Seal for Large Water Treatment Engineering Project, Find Details and Price about Ductile Iron Butterfly Valve Flanged Butterfly Valve from Anti-Corrosion Worm Gear Flanged Butterfly Valve Pn16 Ductile Iron EPDM Seal for Large Water Treatment Engineering Project - TIANYI SUNS PIPE & FITTINGS CO., LTD.