SXR Fitting on nozzle

I am getting my nozzle bored today and I'm wondering if I can fill the hole where the siphon fitting was? I have a wet pipe and I believe one of my overboards is going out that fitting, so could I just put my overboard off the side of the boat? Please help!
 
Location
Idaho
The SXR has a overboard fitting that dumps out next to the pump as well as one on the side of the hull. The nipple on the reduction nozzle is for your stock bildge as mentioned above.
 
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