I will have to agree with RandyStacy. I wouldn't
DIY an external overflow myself-- just too much risk. For about $30, you can get a more reliable design than a
DIY. (I shouldn't say "reliable" since external overflows are known to be unreliable..lol)
If you have to have an external overflow, go with the one where you can put an Aqualifter pump to suck the air gap in the U-Tube. It adds more "reliability"...
