A professional licensed plumber typically charges between $150 and $300 in total labor and service call fees to replace a complete toilet flush valve assembly. Because replacing a flush valve requires unbolting the entire porcelain tank from the bowl and installing a new tank-to-bowl gasket, it is a more labor-intensive repair than swapping a flapper. If you perform the replacement yourself, the replacement kit costs $15 to $25 at any hardware store. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve and drain the tank completely before servicing internal plumbing. Verification: Test the repaired tank with multiple flush cycles to confirm zero water leakage.
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