To fix a leaking toilet flapper, start by shutting off the water supply valve and flushing the toilet to drain the tank completely. Unhook the old rubber flapper from the tabs on the flush valve sides and disconnect the flush chain. Clean away any mineral scale or slime from the sealing rim, and snap a brand-new standard rubber flapper onto the flush valve ears, adjusting the chain to have about 1/8 inch of slack. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when reaching into tank water. Verification: Refill the tank and test with food dye to confirm no water seeps into the bowl.
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