I wouldn't tow if it was running, I'd idle/limp back if there were problems ( unless I was riding from Bahamas to Miami, then limp mode would be impossible over the waves.
I was just trying to figure out ....
a) if plugging the flush port under the IBR would be the same as clamping the hose that is impossible to clamp on the water before a tow and this was answered ( no not the same )
and
b) if I leave my quick connect adapter screwed into the flush port ( which is closed when there is no hose in it ) if this would hurt the ski at all. I wasn't sure if water needed to go in or come out of there while running. still hoping to get an answer on this one.
as far as MPH for towing, the manual says clamp house and town at about 13MPH, but as we know its impossible to clamp that hose without taking the upper deck off so next best bet is to tow at idle speed without that hose not clamped.
I was just hoping that plugging the flush port would be an easier option than having to install a valve that has an easier to reach handle for emergencies.
sorry what I'm typing is all repetitive but I'm thinking maybe I didn't make myself clear before. My apologies.