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Old 05-09-2008, 07:56 PM   #1
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toilet flange


I would like to replace a toilet flange that is attached to 3'' copper pipe. Can I just cut the pipe (I have access to the pipe from the basement). What method is recommended to re-attach the flange? Is there a way to marry the copper with ABS? Looking for any solution!!

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Old 05-09-2008, 09:44 PM   #2
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toilet flange


I haven't actually seen any copper drainage systems yet, but i'd assume this process would be similar to joining abs to cast iron and galvanized.... We use rubber couplers called 'fernco couplers'. Not sure however if that is common practice for copper DWV.

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Old 05-10-2008, 08:04 AM   #3
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toilet flange


Hi all:

Hey, Alan's heading you in the right direction...

You can use either fernco or mission style clamps for this purpose...but they need to be of the shielded coupling design...(see pic.).

Fernco couplings that only have two clamps (no shield...see pic.) are primarily for underground installations...and even then are illegal in most areas that I know about (not saying not allowed in some places, just not best choice in this case). Never mind that the copper is significantly smaller than the ABS plastic so simply won't work without a reducing transition clamp.

Since transitioning from 3" copper to 3" ABS you should just need to go to a local PLUMBING SUPPLY HOUSE (home depot won't have these in most areas) and order a:

3" copper x 3" ABS plastic mission style shielded coupling (clamp)...guaranteed not to leak and meets all code requirements...that I know about.

Hope that helped guys...
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Last edited by Boston Plumber; 05-10-2008 at 08:10 AM.
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Old 05-10-2008, 09:59 AM   #4
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I agree with using a transition clamp. No-hub is a common brand name of shielded clamp/connectors. The rubber seal inside has different size opening on each end to fit the materials you are changing to. I would also mention that since Codes in areas can be different about what is allowable, ask when purchasing the material for repair. In Ohio and Florida, shielded couplings were allowed underground while Fernco was not.
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Old 05-10-2008, 05:17 PM   #5
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it's done...I have cut the copper and purchased a coupler from my plumbing store. I also have a new flange and some abs to adjust the height of the flange when I have my flooring in. Thanks for the help!!!
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