Custom ballast system question

[you da man]

That what the vented loops do. With these installed, you do not have to shut the valves. I had cut the back end off the scupper and kept the screen. This way, it will kept debris out of the pump. Here is a picture of the scupper.



Before I did the cut, the bags would fill while under way. Now that I removed the cups, the system works perfect.

But I was trying to figure out a way to fill while underway and leaving the scupper as is on the stock intake. I know the vented loops prevent the filling while underway but that's IF you grind the scupper off. Instead of using vented loops can't I just shut off the ball valve once my sacs are at the desired level?