I took @furfoxsake_91956 design and just tweaked it a bit to pass through drywall and mate up with a 2.5" pipe on the other side. Attached them with glue, added magnets. Check the magnet hole size before printing to match what you have on hand.
The author remixed this model.
changed the pipe side of the model to flush against the wall and mate up with a pipe on the other side.