I did just that. You can't get it exactly 90 degrees to the side, it's either pointing slightly up or slightly down, but that worked out better than straight up for me. If you take the front housing off you'll see what I mean. If it was used, especially in a fishtank, you'll want to take the front apart anyway to clean it out. Take out the impeller also. Only gotcha is pay attention to where the o-ring goes. It seems to work just the same like this. I read somewhere that Iwaki doesn't recommend running the pump vertically, like standing it on end, but I haven't heard anything about rotating the front. It's very simple, just take the screws out.
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