A Comcast tech came to our 3-unit building, ran a new cable into the utility room, and pulled out the seal that was there before, leaving it open as we're getting cold and wet for fall.

What should I fill this gap with? Is what was there before just some generic exterior silicone caulk? I'm wary to use polyurethane foam I don't want to "glue" everything shut, and caulk can kinda be removed without much destruction. I have some window/door/siding/trim caulk, but I don't know if there's something better to fill the giant gap (or just glob it in there...)

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Duct seal. The stuff from the electrical aisle, not the stuff with a similar or identical name from the HVAC aisle.

A non-hardening putty for sealing electrical ducts (conduits, holes in the wall) against water and insects.

Usually gray. Removable and reusable. Comes as a "bar" or "brick" of putty in a plastic bag (at least when I've gotten it.)

  • I was looking at that, but the specs on it say it's "not for use outdoors" images.homedepot-static.com/catalog/pdfImages/44/…
    – Nick T
    Oct 29 '20 at 20:04
  • 1
    We called it monkey sh!t the duct seal it works best if you roll it in your hands to warm it up, with a hole that large I would put a pull string with a piece of plastic like a bottle cap to pull it out in the future. Use nylon string not cotton cotton can wick water inside nylon won’t. I always have that for sealing penetrations between zones , small holes I use clear silicone but that is quite large for silicone.
    – Ed Beal
    Oct 29 '20 at 20:06
  • The way @Ed Beal describes the sealant as being reusable, I wonder if that is what the blob of gray junk hanging off the wires on the right side is, and if you could just jam it back in the hole?
    – izzy
    Oct 30 '20 at 18:52
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    @izzy good idea but the material that is there looks like the kind that comes in a tube and drys I would be let that stuff is fairly hard. Monkey sh!t is like modeling clay.
    – Ed Beal
    Oct 30 '20 at 18:58

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