When there's enough water in the basin to completely cover the drain opening, the drain can't get air through the water, creating a suction effect that slows the flow of water going down the drain.
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I also have a leak on the sure stop water switch the leak is coming from the blue and red hoses that. If a basin or bath overflow pipe, or kitchen sink overflow pipe is leaking, you won't see this outside as these pipes lead directly down the drain. An overflowing kitchen sink floods cabinets, soaks floors & seeps into walls.
I have noticed that the pipe going from the overflow to the drain (a) has a low point below the level at which it drains, which i think means water and dirt will pool and sit in this low point rather than draining freely.
For more helpful videos like these, subscribe. Great savings & free delivery / collection on many items. At first it would eventually drain which shouldn't be. This is also the case from the bathroom sink.
