Thread: Another Plumbing Question - 3" Fernco Donut Won't fit
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Porchdog Porchdog is online now
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Join Date: Jun 2008
Location: SE Pa.
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The problem is that the 4" OD of the Fernco is to big for that 3" ID.

I think the cast bell is 2" "nominal" cast iron.

See my response in the other thread.
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Old 09-10-2025, 11:12 AM
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