Hi everyone, new pool owner here, our pool is near a tree so a skimmer is a must, so I watched all these YouTube videos on how to install, and all of them the skimmer came with a rubber butterfly gasket, well mine came with two cork gaskets, should I just use those, are they better or worse than the rubber? Or should I order a rubber butterfly gasket? I’ve been looked all over and can’t seem to find anyone that has gotten these cork gaskets, let me know, thanks