What to use to seal an exterior cable penetration in brick?

Question

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...)

Ecnerwal · Answer

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.)

What to use to seal an exterior cable penetration in brick?

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