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You have to take care of this, it's rare. Because the kitchen has its own drainage pipe, the wrong connection is troublesome construction, I don't know how to construct at that time.
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Kitchen and bathroom sewer lines are not interoperable, the first is easy to smell, and the second is easy to block.
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It is the most basic common sense that sewage and drainage pipes cannot be connected together.
No, as long as there is a water-sealed elbow installed under the sink.
It is estimated that the sewer is not smooth, so hurry up and find someone to dredge it, don't wait until it is blocked.
If you don't do such a waterproof bend, you can't drain the water at all because of the large amount of drainage.
Yes, but it's best not to have an interface, when the pipe is broken, it will be troublesome, it is recommended to buy a better pipe, slotted into the wall, basically there will be no problem!
No, it won't. No one will ever see it for themselves.