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No, as long as the position is correct, there will be absolutely no water leakage, but don't forget to use a flange.
It is not possible to walk flat, but with a certain slope. If it is parallel, the water in the pipe will not drain smoothly and it will be easy for sediment to accumulate.
Clean the gap between the connection between the squatting urinal and the ground sewer pipe, do not have water and dust, use good quality glass glue to make up (use more), use fingers or flat plate to make the glass glue poor, and wait for the glass glue to be completely solidified.
It cannot be changed, one of the two calibers is not the same, it is necessary to change small to large, it is easy to block, even if the two calibers are the same, the reservoir is not the same, which is not conducive to urban sewage discharge.
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If you just drop one or two, it won't cause the toilet to be clogged, and it won't affect it.