[Vincerama2]

BonsaiNut, you are confusing the "Durso" with the "Stockman" standpipe. I think both work well, but Ken's design has a smaller profile, so it fits better in overflow boxes, particularly HOB overflows. I use two small durso's in my overflow, and they cram up all the space. I need to put a larger siphon U-tube in, so I may switch to the "stockman" because it gives greater clearance in the HOB box.

Durso = pipe, T, 90 elbow, cap.
Stockman = pipe, reduction fittings, plug (as above)

both are simple an delegant solutions to silencing overflows and I believe the principal is to keep the output pipe (or intake, depending on point of view) under water, and allowing only enough air in to prevent sucking or siphoning effects from the pipe.

V