This channel is located just below the basin. ![]() The bottom part has an outlet hole that allows water to flow into the drain. There are two holes close to the rim of the basin at the top of the overflow channel. In most cases, they are not visible from the top of the sink or from below it. Most sink overflow holes are hidden along the underside of the sink basin. In addition, water drains more slowly in such sinks. Sinks that don’t have overflow openings often send up air bubbles as they drain the water. The overflow feeds the air to the drain pipe and, as a result, reduces the suction effect, which helps water drain faster. When the water completely covers the drain opening, the air gets trapped through the water, thus creating a suction effect that slows down the water flow. This hole also helps the basin drain quicker by allowing air into the pipe via the overflow channel. The overflow prevents flooding by diverting the excess water. ![]() The one purpose of an overflow hole is to keep the bathroom sink from flooding in the event of leaving the faucet on accidentally or having a plumbing issue. ![]() We will explain everything you need to know about the function of bathroom sink overflow, how to clean it properly and your options in buying the right drain with overflow. However, knowing the importance of this bathroom sink space can help keep your drain clean and odor-free. That’s an overflow, which many people don’t tend to pay much attention to. If you have ever taken a look underneath your bathroom faucet, you may have noticed that there is a small hole toward the back of the sink.
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