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Pneumatic Stainless Steel Wafer-Type Double Eccentric Industrial Butterfly Air Valve for Water Oil Gas with API 609 & Tsg Certified - Marine Hardware, Find Details and Price about Valve Marine Hardware from Pneumatic Stainless Steel Wafer-Type Double Eccentric Industrial Butterfly Air Valve for Water Oil Gas with API 609 & Tsg Certified - Marine Hardware - Top Valves Manufacture(Nantong) Co., Ltd.