谢谢!
再谢波大, it makes sense! 这Condo就两层,楼上y型连接上头有pipe(通气?)么,还只用一个盖盖上
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the vent goes through the roof (typically without cover).
-borisg-
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08/07/2022 postreply
20:38:48
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再次谢波大!所以大概是y管上接通风管的联接处,flush短时冲力大时,水就从那里逾出来了
-山地野沟-
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08/07/2022 postreply
20:50:39