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Pn16 Worm Gear EPDM Rubber Seat Ductile Iron Wafer Butterfly Valve for Water Air Oil Gas, Find Details and Price about Butterfly Valve Wafer Type Butterfly Valve from Pn16 Worm Gear EPDM Rubber Seat Ductile Iron Wafer Butterfly Valve for Water Air Oil Gas - Like Valve (Tianjin) Co., Ltd.