I am getting ready to start framing my walk out basement. I had the builder put the roughed in plumbing in the basement when house was built. Starting from the left is the sink drain, then toilet and the sandbox for the shower. My question is in regards to the pipe in the rear of the picture behind the sandbox. I assumed it was a vent pipe. I racked out the walls for the bathroom and this pipe is right in line with the sink drain. If this is a vent pipe, what will be the best way to tie in? Thanks for the help.
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