Added top and bottom adapter caps for 65mm square pipes by request.
I have no mean to test if tight enough, if you give it a try please report result.
This is a simple rain barrel diverter intended for Ø80mm gutter pipe.
It may be adapted to many pipes diameters by editing the top and bottom cap in the sketchup source file included.
Top and bottom should be tight enough to fit to the body without glue.