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Fire Signal Gate Valve with Potter Osysu-1 Switch. FM Approved & UL Listed: Certified for Water Treatment, Firefighting, and High Building applications. Corrosion Resistant Coating: Internal and external epoxy resin coating with thickness above 300 microns. Premium Material Construction: Body made of GGG40/50 ductile iron with SS304/420 stem and bolts. Wide Size Range: Available in sizes from 2 inches to 10 inches (DN50-250). Low Pressure Operation: Designed for PN10/16 pressure ratings with flange connection.