I would not worry about it but watch the connection.

来源: RomaVacation 于 2023-08-31 16:54:39 [] [旧帖] [给我悄悄话] 阅读数 : (91 bytes)
回答: 请教地下室水管生锈问题（ 附图） 由 roadtrip1 于 2023-08-31 15:42:07

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

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