
What can I plug this hole with?
Hello all. A contractor replaced my garden hose pipe because it rusted out. Replaced it with a thinner copper pipe and now there is a large gap around. The other side of the pipe is semi enclosed under a balcony and he plugged it with some clear silicone. I don't need it to look pretty but want to keep the really cold air out in the winter.
What can I use to plug it with?