Well, you are right. They would work the same way, but I am just not looking forward to working with 10 foot long 4 inch PVC. I was at the store the other day and looked at them and then looked at the 4 inch drain pipe (white with black interior) and went with it for my vertical system. It was rigid, light weight, and a bit cheaper.
I guess the downspout idea is in the same vein. Just trying to make handling this stuff a little easier.
Yes, I could use PVC. I'm just looking for alteratives.
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