2x3x4 Downspout Adapter

thingiverse

You'll need a 2 by 3 inch downspout adapter to connect a standard PVC pipe. There are two options available for this connection. First, you can use an adapter with a bell-shaped end that fits over a normal PVC pipe. This is typically used as the final piece in a downspout system where it connects directly to a 4-inch PVC pipe. Alternatively, you can use a straight-end adapter which fits into the bell of another pipe.