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vent stack junction

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dumptruk

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Sep 19, 2020
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corpus christi texas
i have an old house with cast iron vent pipes .when replacing bathroom sink i discovered thatthe junction where the drain meets the cast iron vent pipe and drain is coroded it looks like it was copper. my question is can i unsweat the copper and resolder it or am i going to have to replace it with pvc. i am concerned about open flame and sewer gas
 

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