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You add a vent. There is an under sink vent available. It is a cap that is installed in the waste line as close to the sink as possible as long as it is above the level of the drain. It has a spring loaded lid that the suction from the water pulls open to allow air in to equalize the pressure.

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Q: How do you fix Negative pressure that prevents sink from draining?
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Slow draining sink?

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Partial clog or not enough or proper venting. If it is a single sink, there may not be a vent to it. On a double sink, one side vents from the other. On a single the water is trying to push past the air in the drain.


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You should check your sink pipes if there is something clogging the pipes and creating that pressure. If you are unable to locate the problems, you should contact a plumber to inspect your sink.


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