Hmm, just how hard is it to install an essex flange? Most people seem to avoid it and go for, what appears to be, the worse option of a surrey flange. And, do they come with the nice curved pipe - or do I have to make it - I don't have a pipe bender ! Hmm, I guess I'll need one for the anti-gravity bend too ? Is there any weakening risk in drilling a hole in my tank? many thanks ! John.