Having a professional licensed plumber replace a toilet tank seal (such as the tank-to-bowl gasket and bolt washers) typically costs between $125 and $250, factoring in standard service call fees, labor time, and new replacement parts. If you choose to perform the repair yourself as a DIY project, a replacement tank-to-bowl gasket kit costs less than $15 at any hardware store. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve and drain the tank completely before replacing seals. Verification: Test the repaired tank with multiple flush cycles to confirm zero water leakage.
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