I contacted Zoo Med directly and they had me send the piece back to them so they could analyze it and they replaced it promptly. They were really nice about the situation and took the situation seriously. They requested many pictures and a detailed description of the problem.
I am happy to report that the new piece they sent me was sap free!
I personally didn't want to risk my fish. I hope your issue gets resolved also.
Doberman: Alexander, Ember & Link