Durso help!!!!

[mark]

just sounds like it needs to be tuned with the vent hole.

assuming internal overflow chamber, to give yourself a little more play room can shorten the section of pipe between the Durso Tee and the bulkhead (later increase so you minimize the drop into the chamber).

To give on idea of vent hole size, with my 2" Dursos flowing between 500-1000gph ea, the vent hole is only about a 1/8".