Emily Paxon
New Member
I have replaced to old model toilets with Kohler Cimarron 1.28 gpf using the existing plumbing. The toilets are installed back-to-back. When I flush one toilet, water is sucked out of the other toilet bowl. I have a 2" vent and appears to be clear. I'm wondering if something different needs to be done with the actual plumbing drain lines to accomodate these newer toilets. We did replace the copper with PVC but the configuration stayed the same.
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