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The bathroom will not stink, and it should be connected to other drains, if not, just add a lid to cover it.
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In order to circulate the air in the bathroom, find a sand net and dream of not getting insects and mosquitoes.
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If it is connected to the sewer, it should be covered.
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If you start using it, it will smell, and it won't smell after a long time
Just find a plumber
The upstairs sewer pipe, upstairs repair, it doesn't cost much, because it's downwater, there is no pressure, and it's okay to wrap it tightly with waterproof self-adhesive tape.
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If there is a leak in the water supply pipe, it is best to replace the tee. It is difficult to solve the problem fundamentally by plugging the leak through some glue substances.
It can be tightly wrapped with waterproof tape (self-adhesive tape), because there is no pressure, it is perfectly fine.