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Well, it's really a great questions. As for the black pipes, it's because during the manufacturing process, some materials are added to pretect the pipe, ususlly to anti-UV. In most cases, those pipes that re under the ground or the wall, there's no need to add black materials, and these pipes are ususlly the original color of the ingredients of pipes. Justi like RIIFO's PPR pipes that are usually green.

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qing wu

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2y ago

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Copper pipes will turn black if the cold water running through them constantly condenses. You will see this happen most often during the summer months.


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