A downspout would be very simple to make as well just simply glue in two end caps and a 3 x3 x1 5 tee to your 3 pvc pipe.
Diy pvc pipe rain gutters.
They cut a narrow slit along the length of the pipe just wide enough for the corrugations to fit inside the pipe.
Pvc rain gutters diy out of a 3 pvc pipe cut in half with a table saw and then screwed to the eve using steel hex nut screws how to do it yourself find this pin and more on scraptastic saturdays by scrapality.
Install the gutter and run your 1 5 downspout with 90 degree or 45 degree depending on your configuration.
Turn the handle on the ball valve that is located on your pvc gutter cleaner to the off position.
Now all you have to do is move the pvc gutter cleaner back and forth along the length of your rain gutter.
Clear your gutter of debris by starting near.
They say it can t be done but it sure can just watch and see.