Replacing a toilet flush mechanism—such as a new fill valve, flush valve kit, or complete toilet repair kit—typically costs between $15 and $35 in retail parts if you perform the replacement as a DIY project. If you hire a professional licensed plumber to supply and install a new fill valve and flapper assembly, total service costs generally range from $100 to $250, factoring in local labor rates and trip fees. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve and drain the tank completely before replacing internal plumbing parts. Verification: Test the new mechanism by running multiple flush cycles to ensure zero leaks.
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