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These downspout drainage adapters add a nice finished look to your home’s drainage system and keep rocks dirt and other debris from entering your underground drain pipes. They allow the drain pipe to be cut off even with the ground for a more professional and clean installation. Made of a much thicker plastic than a lot of other types and the unique design allows them to be used with any 3-inch drain pipe. The most common drain pipe sizes used in residential housing are 3 inches or 4 inches, with 2x3 downspouts and 3X4 downspouts. Please check for proper sizing before ordering.