If the chain is too long, it can hang down and become caught beneath the flapper. Trim off any excess to prevent this from happening. When the chain is too short, it will pull up on the flipper when it shouldn’t causing water to constantly flow. Move the chain’s hook down a couple of links until it’s at the right length. Some modern toilets may have a grooved piece of plastic instead of a chain. In the same way, move the float down a groove or two to shorten the length.

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