I ordered a parapet drain with.an overflow feature and it turned out that I had to have a PVC coating. I called the company to get a corrected item sent out. After a week or so the new version arrived, but when I open it, there was no overflow drain. I had to cancel the installation with my roofer and now I’ll be calling tomorrow to have the correct item shipped out to me. This is moving into nightmare mode. It’s cold where I live and soon we may have to wait until spring to install the drain. Super frustrating.