Hearing a toilet flush echo or gurgle loudly inside your bathroom sink or bathtub drain is completely normal and is caused by shared drainage plumbing and air displacement within the vent stack. Because sinks, bathtubs, and toilets all tie into a common vertical drainage stack behind the walls, a high volume of water rushing down the toilet drain displaces air through the interconnected pipes, causing acoustic resonance and bubbling sounds in nearby fixture traps. Verification: Check that nearby sinks drain smoothly without wastewater backing up when the toilet is flushed.
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