I originally posted this in the landscaping forum we haven't come up with an answer that will help me. I have buried downspouts underneath a patio, no problem. THe problem that I am having is finding a 3"X4" adaptor to connect the downspouts to the 4" PVC pipe that I used to move the water. Do any of you have any suppliers that you know of that have a part like this? Any help is greatly appreciated.