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I would like to add a wash machine to the basement. Near the area of the basement where I'll be adding it is a 4 in drain coming from an upstairs toilet. Can I tap the new drain into the toilet drain?

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Can you post a picture? It sounds like what you are describing as the "4 in drain from a toilet" is your stack. If so this is fine. – jamietre Nov 30 '12 at 10:30
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will need a trap for the washer drain. Don't forget! – shirlock homes Nov 30 '12 at 10:39
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The trap arm must be properly vented. Don't forget! – bcworkz Nov 30 '12 at 21:53

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