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Old 12-23-2016, 06:37 PM   #1
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Tiffin 2014 42LH

Sewer smell under the sink in the bathroom in the middle of the coach. What could be causing the problem. I use Camco grey tank deoderizer
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Old 12-23-2016, 06:43 PM   #2
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air admitance valve

Check for an air admittance valve ... if it has an issue it will let some gasses into the coach can buy replacements at lowes or HD in the plumb I ng department !
2018 Tiffan Phaeton 40IH diesel pusher..
Cummins /Allison 10 KW gen,
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Old 12-23-2016, 08:34 PM   #3
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As OWR said, the Air Admittance Valve is a know culprit allowing odors from the gray tank (which can be just as bad as the black tank) into the coach. Do a search for AAV and you'll find tons of discussions about them.
2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previously '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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