The worry-free downspout DiverterPro Kit has an improved capture rate during heavier rains and is easier to clean and winterize. Includes removable filter to capture debris and transparent "door" to see if cleaning is required. Couplers convert from 3 X 4 inch to 2 X 3 inch gutters.The 3X 4 inch internal diameter through the entire diverter prevents gutter overflow during heavy downpours.