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Not all toilets are equipped with a valve. Even though the bowl and tank can last for 25 years or more, if your toilet has a valve, it must be replaced about every five years. In fact, this device tends to deteriorate and leak over time, resulting in a significant waste of water and money. When left in for too long, the valve loses its suppleness and seal. A valve with a deteriorated seal can prevent the flapper on the filling system from closing properly. When this happens, you can hear the tank filling repeatedly, even when it is not flushed. A valve in good condition will only lift to allow the water to flow from the tank to the bowl when you push the flush handle.

There are two very simple ways to check the condition of a valve's seal. First, you can compare the water level before and after flushing. To do this, do not flush for 15 to 30 minutes. Lift the cover and note the level of water in the tank. Then, flush the water. If the water rises higher than before you flushed, it is because the valve is leaking. The second method involves adding colour to the water in the tank and, after 15 to 30 minutes, colour in the bowl means the valve is leaking.

The correct valve helps maintain the effectiveness of the flushing system. It is recommended that you buy a replacement valve when you purchase the toilet.