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This is caused by negative pressure in the drainage/sewer system which can suck the water out from the toilet bowl. To prevent this from happening you must fit an Air Admittance Valve or AAV close to the toilet but above the overflow height of any nearby wash hand basin. The AAV allows air to enter the drainage system to neutralize negative pressure caused by flushing a toilet or letting the water out of the bath etc.

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15y ago

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Should you caulk around a toilet?

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