We bind all of the cables and hoses that pass through this port with a short piece of nylon cord and then from the basement wrap an old hand towel around this mass. We try to stuff the towel into all of the openings and then from below we hang a small container of moth-balls. For moth-balls we fillan old pill bottle drilled full of 3/8" holes and a brass coffee cup hookscrewed into the cap.
For those times that we are not connected to a water supply, we cut a 3/4"thick disk of oak to fill this port. The disk has a notch sawed into it from the edge. The notch is just wide and deep enough to receive the phone and tv cable. No room for rodents.
No pest problems so far.
2010 CROSSROADS CRUISER CR31RE
2012 RAM 3500 ST + CHROME