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Old 10-07-2013, 07:18 AM   #1
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Vent Valve Location ??

We are getting a black water tank smell in the vanity of the coach. Does anyone know if there is a valve or anything plumbed in the system that I could check to make sure it is operating properly?
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Old 10-07-2013, 08:13 AM   #2
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Do you know if your toilet is a Dometic model 300?

Here's a link to a previous thread that deals with the same issue... Dometic model 300 odor problem and replacement

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Old 10-07-2013, 08:56 AM   #3
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I believe it is the 310 since it is porcelain.
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Old 10-07-2013, 09:13 AM   #4
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It could also be a "cheater" valve. See this:
What's that smell ????
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Old 10-07-2013, 09:23 AM   #5
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Quote:
Originally Posted by BarryD0706 View Post
It could also be a "cheater" valve. See this:
What's that smell ????

Thanks Barry - I will take a look in there this evening.
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Old 10-07-2013, 10:46 AM   #6
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We had a black water smell in our 390bh especially when the exhaust fan was on. It turned out to be the back flow preventor valve mounted on our washing machine drain line. The valve allowed the smell to come in until it was changed. You might want to check to see it you have this valve installed anywhere on your system. Good luck
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Old 10-07-2013, 06:06 PM   #7
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Quote:
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It could also be a "cheater" valve. See this:
What's that smell ????
I looked this evening and the cheater valve appears to be located behind a wall. There is also what appears to be vent tube that the sink drain may be connected to instead of a cheater valve.

Why would the grey water smell like black water if the valve is bad ?
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Old 10-07-2013, 06:28 PM   #8
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...
Why would the grey water smell like black water if the valve is bad ?
I don't know why, but I can only tell you that my grey tank smells pretty much as bad as my black tank. I'll admit that I haven't spent much time differentiating between the two aromas however. ;-)
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Old 10-07-2013, 06:37 PM   #9
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The valve that was giving me the trouble and smell did not appear to have any moving parts. Although I thought the washing machine water was going into the grey tank we still had the smell like it was coming from the black water tank (pretty nasty). Once the back flow preventer valve was located and the dealer changed the back flow preventer valve the smell went away. Apparently the grey water tank develops foul odors from food remnants etc that go down the drains in the kitchen and bath. I hope you find the solution to your problem quickly as we know how unpleasant it can be. Good luck
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Old 10-07-2013, 07:01 PM   #10
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The valve that was giving me the trouble and smell did not appear to have any moving parts. Although I thought the washing machine water was going into the grey tank we still had the smell like it was coming from the black water tank (pretty nasty). Once the back flow preventer valve was located and the dealer changed the back flow preventer valve the smell went away. Apparently the grey water tank develops foul odors from food remnants etc that go down the drains in the kitchen and bath. I hope you find the solution to your problem quickly as we know how unpleasant it can be. Good luck
Did they have to remove the washer to replace?

I hate to cut up the wall inside the vanity on a goose chase.
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