There are two valves in the bathroom of the blank room, what do you want to ask for?

There are two possibilities.

1。The extra switch is the one that controls the exhaust air. The extra thread may also be the exhaust line. >>>More

Truth be told, from a professional point of view, it is impossible to explain the purpose of these two holes. Because these two holes do not penetrate the wall, it can be said that they are not used to walk through the pipe, and they are not tap water outlets, so it can be said that they are inexplicable! If there are no pipelines in it, it is a hole with no purpose.

The two-hole fan should be used to remove odor and moisture in the bathroom. But the most common one is a three-prong socket.

There are holes in the wall of the embryo room, which are generally as follows: >>>More

In this case, it is indeed a leakage, but the general situation is that the impact of leakage on the future during construction is basically none, not to mention that each family has to do a cover waterproof and test. Just rest assured!