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Also, if you don't care about looks, for the Weir, use a 3" x 1-1/2" x 3" and turn the top into a grill w/ a short 3" pipe (about an inch or cut to fit) and a knockout cap with holes or use a 3" drain grate. It's how mine is now w/ the second white part. I do have a secondary siphon going into that white 3" PVC Tee but that's for safety because I want 2 siphon tubes going akin to modified herbie design.
I cant totally tell whats going on here, is this essentially 2 weirs connected to each other ?