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[Rob Spence]

I’d just grab a block of duct seal and shove some of that in there.  That’s what it’s for and it’s not the pain-in-the-ass that foam or silicone would be.  You can get it at Home Depot or your electrical supply shop.

+1


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[Scott Holtzman]

+1


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You mean firestop?

[Rob Spence]

You mean firestop?

No, duct seal. It is like a putty like modeling clay. It never hardens. I still have some from 1974 that is fine. I am blanking on the trade name.



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[Hal Bissinger/COMSYSTEC]

No, duct seal. It is like a putty like modeling clay. It never hardens. I still have some from 1974 that is fine. I am blanking on the trade name.

DUCT SEAL

-Hal

[Erik Jerde]

No, duct seal. It is like a putty like modeling clay. It never hardens. I still have some from 1974 that is fine. I am blanking on the trade name.



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It does get stiffer but I’ve never had it become unusable.  Just this past fall at my in-laws I pulled some out of a hole we were patching up and used it to seal some new conduit.  Worked great, had probably been there for a decade, exposed to the MN weather and all.