Hi All,
I'm trying to find a connector to take round water pipe to a rectangular output. something like this:

It's to create a "waterfalll" coming through a stone wall - similar to how a blade looks coming through a wall but using a coping stone instead of a blade. The pipe will be set back in the wall so it can't be seen, but I feel a rectangular one will be easier to seal in place and also will give a better distribution of the water flowing over the coping stone. The one above is for air ducting - does anyone know of something similar for water pipe? I could use 110mm or 2 inch round pipe.
Alternatively do you think the one designed for air ventilation would be fine to use? This is the one above.
https://www.toolstation.com/225-flat...E&gclsrc=aw.ds
Thanks!
Matt