My AC condenser unit is on the roof. The wiring and refrigerant lines run through a PVC pipe in the roof. That pipe is sealed with what looks like some sort of foam product:
I would like to put a TV antenna on the roof and was thinking that using this existing PVC pipe channel would be the best way out to the roof. I can just follow the existing lines and create another hole through this grey foam.
My primary question is: what sort of product is this and/or what sort of product would be best to use to "reseal" the area where I push the coax through?
Secondarily: Is there any reason I should not run the coax out this way?
Here are some additional photos: