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What are the 3 holes basin faucet in the bathroom sinks for?

What are the 3 holes basin faucet in the bathroom sinks for?

Update Time:2021-06-19
Depending on the design of your sink, it may have one, two or three holes, and they may appear between the faucet valves, facing toward you, or under the near rim, facing the mirror. They serve two functions: to prevent an overflow with the drain stopper engaged and to provide an escape route for air in the drain.