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The butterfly valve type 563 has been specially designed to fulfill aquatic and water park requirements where outstanding quality and economic valves are demanded. - Wafer-style, intermediate installation butterfly valve type 563 PVC-U With hand lever Flange standard metric/ANSI/BS/JIS - Wafer-style, intermediate installation butterfly valve type 563 PVC-U With pneumatic actuator - fail safe to close (FC) Without manual override Flange standard metric/ANSI/BS/JIS