1 answers
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Anonymous users2024-01-24There should be, and it's best to go to the local area and ask to see if it's sure there is.
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Is there a one-way flap at the bottom of the toilet? What is the reason for frequent flooding on the
1 answers2024-05-29
There is no backboard, just a U-shaped submersion, and the water sinks in the middle of the U-shape to block the air coming up from the sewer. It is this principle of anti-odor, there is water gushing up below can not be stopped, find someone to clean the sewer, the inside is blocked or not smooth. The first floor is the most common, everything upstairs rushes down, and as soon as it is blocked, it rushes back to the first floor.