A leak originating from the bottom of the toilet reservoir (tank) is typically caused by deteriorated rubber tank-to-bowl gaskets, corroded metal bolts, or a loose large flush valve locking nut on the underside of the tank. As rubber seals age and harden, they lose their ability to maintain a watertight compression seal against the porcelain tank opening, allowing water to drip down. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve and drain the tank completely before tightening or replacing tank bolts. Verification: Dry the area completely and watch the tank base during a flush to locate the exact drip source.
1 votes
Marked as accepted