Can I guess that you are interested in this product because you have an issue with odor, perhaps from the bathroom? I have encountered some issues with a sewer smell on occasion. My take is that it occurs after a day of travelling and in my case comes from the shower drain. The solution I have found is to pour some water down the shower drain after stopping. If there is a p-trap below the shower this fills it up again and it forces you to check the tightness of the drain plug for the shower, a second cause of odor.
No, it was never serious enough that I considered a vent extension. And mine would be gray water exhaust. Or are both the gray and black water vented into the same stack?
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Paul and Janet Braun
2003 Toyota 4Runner V8 now 2012 Toyota Sequoia V8
Escape 19' 2010 now 2014 Escape 21'
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