Key warning signs that your toilet flush valve assembly is failing or worn out include continuous water leakage from the tank into the bowl that persists even after replacing the rubber flapper, visible cracks or warping in the plastic flush valve body, severe mineral corrosion on brass valve shanks, or a loose flush valve locking nut on the underside of the tank that leaks water onto the floor. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve and drain the tank completely before servicing flush valves. Verification: Inspect the tank interior and verify whether water continues seeping past a brand-new flapper.
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