How do I seal my air compressor line?

Question

I have central air and outside is the compressor The freon line runs up the wall to the attic. It is covered by a metal frame. at the bottom where the line go into the metal is open and rats are getting into my attic from there. I seen on other houses they used some sort of concrete does anyone know the brand name of this concrete It looks like some sort of plaster . and I do not want to use spray foam

Answer 1

Try a small pail of Quickcrete Concrete Patch, available at any hardware store such as Lowe's or Home Depot. When you mix it up don't add too much water and keep it stiff almost clay-like which will allow you to stuff into the hole.

Answer 2

Its probably "concrete patch" that can be bought at any hardware store