Which Fernco coupling?

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Old 06-05-19, 06:48 AM
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Which Fernco coupling?

I need to extend a sewer vent in my lawn, the sewer pipe is 5" clay, with a 6 1/2"od. The extension pipe is 4" pvc, with 4 1/2"od. I'd like to use a fernco coupling, but not sure which to use. Can anyone help? I know they go by size of pipe opening, but not sure how big the id's really are. Any help is greatly appreciated.

Steamboat Willy
 

Last edited by Tolyn Ironhand; 06-05-19 at 07:03 AM. Reason: Changed Fenco to Fernco.
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Old 06-05-19, 09:09 AM
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Fernco couplings go on the outside of the pipes so you go by the outside diameters.
 
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Old 06-07-19, 10:36 AM
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One of these: 5" Clay to 4" PVC
https://www.supplyhouse.com/Fernco-1...st-Iron-or-PVC
 
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