I have found a good central location to mount a router, however it does not have power nearby. Instead working with 120V wiring, I thought it might be easier to just make a small hole/tunnel/conduit out of PVC pipe and fish the small end of the power adapter through it. Distance wise, it's not far, just through a single wall, or about 4' - the problem is that this wall is between the house interior and the garage, and there is quite a temperature difference, so I would like to "fill it up" somehow such that there isn't much air moving in/out. Is there any good approach for doing this, while allowing the wire to be replaced? (for when the router dies in X years and it's time for a new one).
some sort of "cap" that can be put on the PVC tube, such that only a small opening for the wire goes through it, something like two half-circles that fit together
Some sort of terminal where the wire connecting through the wall does not change, but cutting in a new wire would be easy, like this but longer: