@Christo Thanks that is clever! I can sort of picture the setup. When you done with the assembly please take a pic. Awesome woodwork there!!Hi @Murphy
The Bottom Holes are the Inlets/Returns. The Return Line first moves up along the tank Just above the waterline then back down to the bottom holes, then theres a Small 8mm line at the top before the return moves back down, this 8mm line is tied into the Back of the overflow, if the Pump trips air is sucked thru the 8mm line breaking the Syphon and preventing the Display to loos Level.
Hope that makes sense......