If I completely turn the ball valve in the closed position imitating a clog the stockman can't handle the flow and will over flow.
As for the drawing. The red thing is the ball valve and the circle going into the sump is a bulkhead. The over flow is an external overflow. I ideally would want to use the Herbie method, but with the 2 lines joining into one this doesn't work. Not sure what I can do from here.
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