We have very hard well water where we live. The original rubber seal on the drain plug had hardened and was no longer able to seal properly due to limescale deposits. I have tried to find an original Delta brand at a local store with no success. I chose the "Universal" brand and they just didn't provide a good seal and the water was slowly draining out of the sink. I ordered the original Delta connector and it works great. The difference as far as I can tell is that the Universal model used a harder rubber o-ring while the Delta model used a more flexible "flip" seal and that was the difference between disappointment and Satisfaction.
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