Get a Versiplug max!!scuppers are boat sinkers or increase the chance some on here would say...
been running a good sump pump valve (cost me $29) from the local plumbing shop in my square for 2 seasons now, not one problem. I did glue a threaded inspection cap to the inside of it, so anytime I want to cap it I can.
Chadman - if you know of his screen name on the X that would be cool, I am just trying to locate the original build thread. I am curious as to how/what he used for footholds, foam, glass etc after cutting it all apart.