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FTG Series Manual Gear Operators are designed to handle the toughest applications and provide years of trouble free service and reliability. for Fisher™ Butterfly Valves. M Series handwheel gear actuators are totally enclosed, weatherproof, worm gear actuators for reliable manual operation withPlasgear™ operators are designed for use with ¼ turn butterfly valves having an ISO 5211 F07, F10 or F14 valve mounting flange. They feature an engineered resin