the orig setup is vented, the main stack goes up through the roof. I'm attaching a photo for clarification. in the current unfinished room the washer drain hose just goes into the pipe. for this I'll use a drain/valve box (Oatey I think I bought) so I can finish the wall. AAV's aren't allowed here. that said, I would rather have one than not. I'll tie the pvc into the copper stub out with a rubber gasket.
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