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DN50-DN2000 Halar Coating /Painting Double Flange Concentric /Center Line Vulcanized Rubber Butterfly Valve for Sea Water Shipyard Marine Industry, Find Details and Price about Manual Electric Hydraulic Control Valve High Quality Butterfly Valve from DN50-DN2000 Halar Coating /Painting Double Flange Concentric /Center Line Vulcanized Rubber Butterfly Valve for Sea Water Shipyard Marine Industry - Tianjin Tanggu TWT Valve Co., Ltd.