Home Depot type scupper tubes, danger!
Fellers, Be cautious with those thin walled scupper drains. Based on another E31 owner doing the job first, I was finally inspired replace all three of mine because the aft, center one had that tube which was on its las legs. I shudder to think of the potential catastrophe if it were to have broken free with the hose falling to the bottom of the bilge. Seeing the paper thin remnants was enough to convince me to replace it and the other two as well. Please see the attached images of the thin tube and the beefier 1 1/2" cast bronze Perko replacements. Mind you, the hose clamp was attached in that very spot and might have contributed to the brittle walls collapsing the way they did. Let me explain here why I resorted to such a seemingly expensive remedy. I think you can tell that I removed the chrome from all three of them in areas where it would show with my 48" fixed belt sander. I bought all three of them used at Minney's marine consignment store in Newport Beach CA for $15.00 each and immediately replaced all the inner floating balls before sanding them down prior to installation. So although lovely and expensive looking, they were a great budget solution to a large and dangerous problem. A hole saw, a couple of Hail Mary's and I was almost home free. I drilled and tapped the fiberglass with the clear understanding that the bronze screws would never come out in my lifetime, and the boat was now much safer. I'm too big a guy to have made it back into the bilges to attach the hoses, that was relegated to my loving and skinny wife Marilyn. Enjoy, Glyn Judson, E31 hull #55, Marina del Rey CA