To connect 2x3 or 3x4 downspouts to 4" black flexible plastic drain tile pipe.

2x3 Adapter inside dimensions: Approx. 3 1/4" x 2 3/8"

2x3 Pipe outside dimensions: 3 5/8"

3x4 Adapter inside dimensions: Approx. 4 7/16" x 3 7/16"

3x4 Pipe outside dimensions: 3 5/8"