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Installing an outdoor surface mounted electrical outlet on stucco

I'm installing an outdoor electrical outlet and since it's on stucco I'm mounting it on the surface. I bought this:

But I don't understand how to mount this to the stucco wall. I thought there would be four screw holes, one on each corner where I would screw it into the wall after drilling screw holes into the stucco and inserting the plastic anchors. There are four screws on each corner but they don't go all the way through to the back of the box. Did I buy the wrong thing? If so, which one do I need to buy?
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Posted 2018-08-22T22:30:27+0000  by primehalo primehalo
You can just drill out the little dimples in the back of the box.  Use a drill bit a little larger (1/16") than the screw you will be using.  You don't need 4 screws to hold it to the wall, 2 will be plenty.
Posted 2018-08-22T23:31:39+0000  by Adam444
Thanks for the response, I wasn't aware you could drill thorough that. I have #8 screws with plastic anchors it sounds like I should use a 7/32" drill bit (5/32" + 1/16")
Posted 2018-08-23T00:39:04+0000  by primehalo
Those boxes are just cast zinc or some other soft material, easy to drill through.  I might up it to a #10 screw, but I tend to be a little overzealous from time to time. <lol>
Posted 2018-08-23T09:02:23+0000  by Adam444
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