Johnymack

Hi everyone I've recently bought an einhell chain saw,and there's a rubber pipe with a black screw in it on the right hand side as you hold it. If you unwind the brake lever casing it detaches...and there it is sitting in an s-bend channel..I'm thinking it could be an air breather pipe for the fuel tank ? It's not dripping mixer oil as I've had the screw out and appears ok...any ideas ?