I have never seen any mold on a water valve cork but anything is possible. If you are in doubt, just have the cork replaced. It is cheap and you usually don't have to leave the horn. _________________ Harry Marks
Yes, they can and will. I have a student Conn 1050B and the spit valve corks did mold...but I think that's because I was in middle school and never cleaned the darn thing.
Just get them replaced if you think they're bad. It's not a big job to do.
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