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It probably has no vent. The vent is used to allow air pressure to get around the material that is going down the drain and prevents the water in a p-trap or toilet from being sucked out as the water goes down the drain past it. Sometimes the vent is there but blocked. Sometimes no vent was installed. It can be a serious problem, especially if sewer gas leaks into the home when the toilet makes that noise.

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19y ago

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