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Old 01-23-2012, 09:33 AM   #1
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Toilet ventilation problem


Master bath (toilet-1), guest bath (toilet-2), approximately 6 feet apart.

toilet-1, when flushed, sucks water out of toilet-2.
toilet-2, when flushed, water in toilet-1 shakes slightly, but not sucked out.
Toilets are "Kohler 1.6 gal per flush".
These replacement toilets were installed a couple of days apart.
I re-installed toilet-2 again recently, but no change!

How do I go about finding the vent problem?

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Last edited by nelsonb; 01-23-2012 at 09:52 AM.
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Old 01-23-2012, 10:44 AM   #2
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Toilet ventilation problem


Do you know if the master stack is between the two bathrooms? In my place the toilets are side by side with the master stack in between. If you are not sure, look at the roof and see if a big vent pipe comes out of the roof in that approximate area.

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Old 01-23-2012, 02:30 PM   #3
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Toilet ventilation problem


Sounds like toilet 2 is improperly vented....maybe wet vented. Is there a crawlspace or some way to get a picture from underneath?
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Old 01-24-2012, 09:49 AM   #4
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Toilet ventilation problem


I'm located in Cincinnati, Ohio.

Recently, I went on my roof and ran a hose into the vent pipe.
Using a pressure "bladder" on the hose I was able to feed 23 feet of hose into the vent pipe and power sprayed for 30 minutes - NOTHING CHANGED.
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Old 01-24-2012, 10:20 PM   #5
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Toilet ventilation problem


Was this happening with the old toilets? You may have to go in with a camera and check, which line needs to be corrected you may not have to re vent the system, depending on the conditions and layout of the plumbing in your home you may be able to add a relief vent. Good luck
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Old 01-28-2012, 09:55 AM   #6
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Toilet ventilation problem


I should have answered your first question, sorry.
The master vent stack is between the two toilets, based on the location on theroof.

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