Toilet tank leaks in the bowl: How to repair
Toilet tank leaks can cause a very annoying hissing sound that continues even after flushing. If you hear such a noise coming from the toilet tank even when it is not in use, it means that your toilet has a leak somewhere. If water from the tank drips into the bowl, there is probably a problem with the flush valve.
Step 1 - Lid
Remove the lid from the toilet tank so that you can see inside.
Step 2 - Water
Before proceeding, locate the isolation valve under the toilet pipe and turn off the water. Flush the toilet to expel the water in the tank. After shutting off the water, the tank will not fill up.
Step 3 - Flush valve
Watch carefully as the water descends through the flush valve as you flush the toilet. The discharge pipe below is the pipe where the water flows back into the tank. Above it, you should see a rubber ring and a valve that fits into the hole at the bottom of the tank. Remove the drain valve and check the rubber washer. It may have shrunk, which is partly the cause of the leak. Remove it and fit the new valve.
Step 4 - Replacing the valve washer
Replace the old rubber washer with a new one and fix it in place. Reinsert the rinse valve into the hole and make sure it fits tightly. The valve must remain loose enough to lift up when you pull the flush lever.
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