Hole In Sink: Explained
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. Without this hole, a full basin of water would drain slowly because of the resistance it puts on air escaping up from the drain. An alternative escape route keeps air moving and the drain line flowing at full capacity.
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You may have noticed that your bathtub has an overflow vent hole, too, but not your kitchen sink. In the time it takes bathtubs to fill, people may walk away and become distracted. Thus, the safeguard. In the kitchen sink, the divider between the two standard basins rises lower than the rim, providing overflow protection. The drain in the second basin also serves as the vent for the first, providing a route for air to escape the drain line.
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Another concern that prevents an overflow hole from appearing in the kitchen sink: bacteria. That little passage can harbor bacteria that may contaminate food or even dishes and utensils as you clean them, with the potential to make you sick.
Occasionally, bacterial growth in the sink overflow vent causes a foul odor. This signal is your alert that cleaning is past due.
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