Nate
Chamber Plug
This plug works as intended but in my case it was slightly smaller than the port in chamber two and I had to superglue it in place. Other than that, it has definitely improved the flow into the built in sump for the Evo XII. I understand Fluval's design choice with having this port to chamber two, but it makes me wonder, why didn't they provide a plug for this AIO tank as another option?