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Diagnose a Running Toilet in 3 Easy Steps

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Step 1: Check the Overflow Valve
Check the toilet overflow tube for running water.

Check the toilet overflow tube for running water.

Aaron Stickley
Check the overflow tube. If you can see water going into the overflow when the tank is full then, you know that the fill valve Compare Prices is not shutting off all the way and needs to be replaced.

 

 

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