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I'm going to guess the old sink was porcelain or cast iron and the new one is cultured marble? If that's the case, the old one had an over flow hole at the top of the bowl so that is wouldn't over flow. That was the vent for the sink. Cultured marble ones don't so the water is trying to go down against air pressure. If this is the case, it can be fixed or at least helped. Message me back for the details.

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Q: Why does a new bathroom sink and drain with metal pipe make a gurgling sound and drain slowly when it is not clogged and the old sink and drain with PVC pipe did not gurgle and was not slow?
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