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Old 06-01-2015, 04:11 PM   #1
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I have a recent issue where we are getting a sewer odor from under the kitchen sink. I have checked all fitting, no leeks. But when we open the cabinet under the sink it smells. Any suggestions as to where the smell is coming from?
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Old 06-01-2015, 05:11 PM   #2
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Could be the AAV. We had one go bad during the 1st month of ownership on a SOB 5th wheel. Went to Home Depot and got this. Oatey Sure-Vent 1-1/2 - 2 in. ABS Air Admittance Valve-39018 - The Home Depot.
It did the trick for us. Not sure if you one under your kitchen sink but if you do it could be the problem. It's not uncommon for RV manufactures to use cheap components.
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Old 06-01-2015, 05:51 PM   #3
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They make a de-odorizer for the gray tanks. Last thing at night I will close the gray tank valves and drop in a de-odorizer tablet. Run just enough water to dissolve the tablet. I want some of the dissolved tablet to stay in the trap. I keep the gray tank valves closed for the next day or two. Then open them.

This will keep odors at bay for 2 - 3 months.
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Old 06-01-2015, 06:45 PM   #4
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There should be no odor under the sinks because of the traps in the line preventing air/odor from the tank coming up the sink drain. I suspect the air vent valve also.
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Old 06-08-2015, 02:33 PM   #5
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need a bit more clarification on Oakley Valve

Quote:
Originally Posted by Cumminsfan View Post
Could be the AAV. We had one go bad during the 1st month of ownership on a SOB 5th wheel. Went to Home Depot and got this. Oatey Sure-Vent 1-1/2 - 2 in. ABS Air Admittance Valve-39018 - The Home Depot.
It did the trick for us. Not sure if you one under your kitchen sink but if you do it could be the problem. It's not uncommon for RV manufactures to use cheap components.
Thank you for responding. I have 2 vent pipes that vent through the roof of my Fifth Wheel. The Oatley method seems to be used for applications where there is not vent in the roof. Can you let me know if I'm understanding the application correctly. Thanks!
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Old 06-08-2015, 02:38 PM   #6
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The odor is not coming from the drain, it is coming from cabinet under the sink in the kitchen. I use deodorizer in my tanks every time we take out our fifth wheel.
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Old 06-09-2015, 02:21 PM   #7
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There is a vent under the sink in both the kitchen and the bathroom...they are different from the vents on the roof. Look under the smelly sink in the cabinet and you will see a pipe that goes up next to the sink and stops below the underside of the counter - it has the one-way vent on it. Just unscrew it and screw the new one on...

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Old 06-09-2015, 11:48 PM   #8
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I am goimg to assume you have a P-trap under your sink that smells. Is there any leakage? Do all the fittings appear to be glued together? I the kitchen sink on it's own gray tank, or is it shared with the bathroom?
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