Repair The Vertical Valve On A Running Toilet

A toilet that works well makes life easier.

When a toilet continues to run after it has been flushed it’s likely the result of a faulty vertical valve, or the flush valve. The flush valve controls when water enters the tank and it has a float which shuts off the water when it reaches the proper level in the toilet tank. A new flush valve will cost around $7 and can be installed by the novice in less than half an hour. Does this Spark an idea?


1. Shut the water off to the toilet. If the toilet has its own shut off use it; otherwise the main shut off for the entire house will have to be used. Flush the toilet and remove as much of the water in the tank as possible.

2. Unscrew the toilet supply line from the bottom of the flush valve. Loosen the plastic nut from the bottom of the outside of the tank underneath the old flush valve. Channel locks may need to be used to loosen it. Remove the old flush valve. Place the shallow bucket or pan underneath to catch any water that may drip out.

3. Compare the old flush valve to the new one to ensure the new one is the same length as the old one. The flush valve is adjustable so if it needs to be made longer simply unscrew the bottom which telescopes out.

4. Place the black rubber gasket (from the kit) onto the bottom of the new flush valve. Insert the bottom of the flush valve through the hole in the bottom of the tank from the inside.

5. Tighten the plastic nut (from the kit) to the bottom of the flush valve sticking through the tank. Attach the toilet water supply line and tighten.

6. Attach the black rubber tube (from the kit) to the nipple at the top of the flush valve. Place the other end in the tank’s overflow reservoir. Turn on the water.