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En558-1 Series13 Series14 Ductile Iron Double Eccentric/Offset Rubber Seal Butterfly Valve, Find Details and Price about Big Size Ductile Iron Butterfly Valve Double Flange Eccentric Butterfly Valve from En558-1 Series13 Series14 Ductile Iron Double Eccentric/Offset Rubber Seal Butterfly Valve - Tianjin Tanggu TWT Valve Co., Ltd.