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Worm Gear Lug Wafer Pn10/Pn16 Ductile Iron/Cast Iron Butterfly Valves, Find Details and Price about Butterfly Valve Lug Wafer Type Butterfly Valves from Worm Gear Lug Wafer Pn10/Pn16 Ductile Iron/Cast Iron Butterfly Valves - Like Valve (Tianjin) Co., Ltd.