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If it leaks, the water tank will keep flooding, and the water will flow out in vain.
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It should be an anti-backwater device, a check valve.
Prevent water from the tank from flowing back into the water pipes and contaminating the tap water.
The toilet inlet valve is generally not easy to break, and sometimes the water level of the water tank is too high, you can lower the float valve by a point.
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If you look at the inner core of the toilet, it must be inflexible or leaky due to aging.
It's okay to change a triangle valve, and buy a good quality all-copper triangle valve, so that it will not break down often in the future.
The top is to fill the basin with water, and if you can't adjust it, it's dead, and the bottom is to fill the water tank, which can be adjusted, and its level directly affects the amount of the water tank.