thats what I did...but I made the hole ever so slightly too large....if you wiggle it you can hear the air hiss...
I either need to drill it out for a bigger one, or epoxy the one into place....
Wrap 5 or 6 layers of teflon tape around the threads to tighten it up a little. This should get it sealed up. I drilled out an old tank that had broken nipples. I used the brass units with teflon tape and it has worked fine for months now.