Foam pieces in powder coating gun?

Since there are no stupid questions (only stupid people, haha), here we go!

I bought a little Craftsman powder coater to play with (it was only $35) and in the powder canister, there is what looks to be 2 small pieces of orange foam (look like ear plugs, but one is longer than the other). Is this in there for a reason? Do I need to leave it in or remove it? I read the whole manual, watched how-to's online, and saw nothing about what these things are for. :confused: I'll snap a picture when I get home if no one has a clue what I am talking about, haha!