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Manual Handle Flange Butterfly Valve D41f-10/16q, PTFE Seat Anti-Corrosion. Precision soft/hard sealing design eliminates backflow and external leakage, guaranteeing system safety. Made to international standards, 100% pressure tested, with 1-year warranty for peace of mind. Flanged, wafer, socket weld connections available; compatible with manual, electric, or pneumatic actuators.