said by Jon5:I guess from your picture I might not be understanding what you're trying to do. You want to seal the lid to the floor or just the raw edges of the floor where the hole is?
I think he just wants to seal the raw edges, but allow water that finds itself under his floor to be able to flow to the sump. Also, presumably, water ON the floor should be able to flow through the slots and into the sump, too.
Give this (and now that I wrote it, it's clearer in my mind) I'd suggest some PT wood trim, painted to approximately match the finished floor's color.
