I was wondering about drilling holes in Bell boxes as far as the UL listing goes. The side mounted brackets they provide with the box are really flimsy. I usually install a couple screws through the back with a washer and some caulking. I just call them plugged drain holes to meet code.(ha) I also found that water seeps in through the hubs, so I always caulk those too. The boxes are designed so that when you screw the hub seal in all the way it leaves a nice little cup for water to sit. I guess if they made them any better they would cost more than 3 bucks.
