Originally Posted by Mike Leary
I've tried gypsum rock, metal mesh, duct tape,ect. They STILL get in! I believe the only answer is to 90 the valve high enough (wire in sweep conduit) and pour concrete in the bottom, sealing not only the bottom, but the cut-outs of the v.b.
i like this idea of a layer of concrete. A thin layer of concrete or a masonry mix should be enough to keep them out but still thin enough to be easily removed if needed.