If the clog is close to the drain opening, the overflow fitting can still work to prevent water from overflowing.Īs you can imagine, it’s highly important to keep the overflow hole unclogged. The overflow drains in tubs work a little differently as there is more distance between the opening and the connection. The job of a bathroom sink overflow is to protect against overflow when the drain stopper is closed, and the faucet is left running – not when there is a clog in the sink. The overflow outlet is located very close to the drain opening so it’s unlikely that a clogged drain will be rectified by an overflow. Most people are under the impression that a sink overflow will prevent water from overflowing when the sink drain is clogged. If you run the water at full volume, the overflow channel will only delay the water overflow for a short time. While this prevents the water from spilling over, it won’t prevent an overflow for long because the sink overflow holes are normally very small. If you close the drain and fill up the basin up to the overflow hole level, the water will start draining into the overflow opening. So by now, you have learned the purpose of a bathroom sink overflow and how it works. Both the overflow and basin empty into the same drain pipe, but the main difference between them is that the overflow is always open. 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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