I was afraid you were going to ask that.I honestly don't remember. I certain it was not 1/2", but something a little smaller. Probably 3/8", maybe even 5/16"
There is a post here somewhere where I said what I used, but I have no idea where that thread is.
I'll go to my local Ace and see what kind of drill bits they have. I mean, it is water. It can drain through a pretty small hole, but the hole has to be big enough so that it doesn't get clogged easily.
