Originally Posted by Pldcoyote
Elixir Vent lid is unbreakable and comes in the size and color you want.
See this web page
. You can gain two pieces of information.
The lid is polycarbonate. It will be "unbreakable" as shipped but in a year or two of outdoor exposure it will turn yellowish and in another year or two it will be so weak and brittle that a pine cone will go right through it. Polycarbonate simply isn't stable to the ultraviolet component of sunlight.
If it were really "unbreakable" it would have a lifetime guarantee. I saw no mention of one on this web page.