I would not worry about it but watch the connection.

來源: RomaVacation 於 2023-08-31 16:54:39 [] [舊帖] [給我悄悄話] 閱讀數 : (91 bytes)
回答: 請教地下室水管生鏽問題（ 附圖） 由 roadtrip1 於 2023-08-31 15:42:07

Looks like sewage line. Not common to see expensive copper sewline any more. 

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