Yep, on the outlet side, on the end, about 3/4's of the way up. It has to go on the end; it's the only place. The tank may not get completely and totally flushed perfectly, but the one I got works good enough to flush the tank as needed. My royobi 18v drill will fit to make the hole. I rubbed a little sandpaper on the outside and on the surface of the device itself so the silicon sticks better.
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