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This kind of pipe seems to generally have a warranty period, if there is a problem during the warranty period, the developer or construction unit of the house is responsible, and the residents are responsible for the warranty period.
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If the warranty period is not exceeded, the construction team is responsible, and the owner is responsible after exceeding.
Because they are all commercial houses now, if there is a problem with the internal facilities after buying a house, they should find someone to repair and pay for it. If there is a problem with the common part of the wall, the property department will be responsible for repairing.
For your own renovated house, the toilet is generally purchased and installed by yourself, so you need to charge relevant fees when you find the property for maintenance, and of course, you can also find a professional maintenance personnel to replace or repair it.
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If it is caused by rain, the property is responsible, and if the root cause is your own oil blockage, the property is not responsible. Because, the rain problem must be considered by the developer, and the design is reasonable, and this problem will not arise.