Just in case anyone is curious, I ended up using a 3/4" pipe tap (Drill America DWTPT3/4 3/4"-14 NPT Pipe Tap, Carbon Steel, DWTPT Series) to put a few threads into the plastic of the opening. I put thread tape on a 3/4" brass plug (3/4 in. MIP Brass Plug Fitting) and screwed that into the threaded hole. I no longer have the ability to drain the tank, but I'm happy to now have a tank that I can use again. If I do need to completely drain it, I'll just use a pump through the fill hole. Thanks again everyone for the suggestions!
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