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Havoc-XT Blok combines a powerful active ingredient with a superior shape and weather resistance to form an outstandingly useful and effective rodenticide. Havoc-XT is a uniquely-shaped low profile block that fits better than competitive products in narrow cracks and crevices, and features many sharp edges and grooves for easy gnawing. Because of superior durability and weather resistance, Havoc-XT is one of only a few products approved for sewer and drain usage.