I am trying to install these in freshly poured concrete (sonotubes) What is the correct way to install the support and what are the pros and cons for each one of them

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The other option is this. I like the first option more but the support does not seem to be designed to work that way. I think that the tube that the screw slides in will allow water to get into concrete

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You seem to be asking about the orientation of the threaded socket. The lower the height of the bracket, the better for stability. This favors the first option. Also, with the first option you don't have to drill for anchor bolts. I'd only use the second option if you need the height for some reason.

If you're worried about water you could fill the socket with grease or silicone caulk.

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