I Am in the process of completing a patio that invovled burying the downspouts from the house and running them below grade to a lower point in the yard. THe problem that I have is the downspouts are 3" X 4" and the only connectors that I can find to connect to a 4" PVC pipe is a 2" X "3". anyone out there have any ideas if there is a product that I can use to reduce this size? If so any information about where to call would be helpful. Thanks in advance.