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No, it is a water replenishment pipe, which is used to replenish the water seal in the horse pipe, and if it is closed, it may cause the siphon toilet to not flush clean.
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You mean that.
Let's get on the plumbing. It's OK to close.
What are you going to do, though.
After it was turned off, there was no more water to use.
Occasionally, often not.
You're kidding.
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You can directly flush it into the toilet, and pouring the tank will break the float valve.
The water in the toilet tank is not drinkable, it is tap water, and generally no one cleans it, it is not very clean.