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I installed a new faucet and drain pipe assembly. I found that there's a small hole at the bottom of the sink (underneath). Water is coming out of it. When I pull up the stopper (so the water collects inside the sink), there's no leakage. But as soon as open the stopper or open the faucet, water is start dripping through this hole.
Anyone knows why is it here, why is it leaking, and how could I fix it? There didn't seem to have a cover or "plug" for it previously.
Thank you.
This looks like it's tied into the overflow system for the sink. Your old drain pipe might have covered it up. If the old gasket will fit on the new drain pipe you could just reuse it or get a duplicate gasket from your plumbing supply store. I would hesitate to just plug up the hole because you never know when your plug would fail and you'd have a big leak. It could also compromise your overflow protection. You could also just put the old drain pipe back on the sink if you can't get a new exact match.
