While I have the power head off my y302 tower, I thought I would add a hole in the back of the tower I've seen people use to facilitate flushing and cooling with a small electric bilge pump. This is where I'd put that hole, right? And what size? It seems someone once told me to use 1/4 NPT but that requires a 7/16 drill -- that's a pretty big hole! The hole I'm meeting up with is about 5/16 in diameter.

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