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Pro tips from the experts in Plumbing, Drains and Water Cleanup. Roto-Rooter presents: How to Replace Your Toilet's Flapper Valve. What you'll need: flapper valve and a rag. Turn water off and remove toilet tank lid. Flush the toilet and let water drain. Detach leaky flapper valve and wipe off seal. Determine the chain length of the leaky flapper and match that length on the new flapper. Attach new flapper valve and check chain length. Turn water on, let tank fill with water, and give it one last flush. Replace toilet tank lid. ♪ Call Roto-Rooter, that's the name, and away go troubles down the drain. Roto-Rooter! ♪