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Old 02-17-2019, 01:28 PM   #1
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Sewer smell under bathroom sink 25ft airstream international 2015

We are at a campground where they come and pump your tanks
Today they pumped it and there is an open hole under the sink in the bathroom and it smells horrible. Sewer smell
What could have happened and what do we need to do help
The tank was 100 % full
Please help we have 10 more days and not sure we can stay unit with that smell
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Old 02-17-2019, 02:52 PM   #2
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Open hole under the sink? Picture would help, shot in the dark guess is the air admittance valve failed from the vacuum the truck put on your system.
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Old 02-17-2019, 04:00 PM   #3
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Open hole under the sink? Picture would help, shot in the dark guess is the air admittance valve failed from the vacuum the truck put on your system.
Tried to attach a photo
How do you fix the problem you mentioned
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Old 02-17-2019, 04:00 PM   #4
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tried to attach a photo
how do you fix the problem you mentioned


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Old 02-17-2019, 04:02 PM   #5
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Open hole under the sink? Picture would help, shot in the dark guess is the air admittance valve failed from the vacuum the truck put on your system.


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Looks like the lavatory sink may drain into the black tank as well ????
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Old 02-17-2019, 04:13 PM   #6
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So if it is the air admittance vavle its probably just indide the wall opening, you can try covering it up with a bag and tape to seal until you can replace it. They normally unthread.
The use of a pumper truck sucking your tanks empty was talked about some time ago, you can lessen the chance of vacuum damage by holding the toilet flush open during this process.
Also ask the driver not to use maximum suction.
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Old 02-17-2019, 04:25 PM   #7
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If they used strong suction to clear your tanks, you may need to refill the sink trap with water. Run about 2-3 cups of water down the sink and see if the odor ends.
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Old 02-17-2019, 04:36 PM   #8
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So if it is the air admittance vavle its probably just indide the wall opening, you can try covering it up with a bag and tape to seal until you can replace it. They normally unthread.

The use of a pumper truck sucking your tanks empty was talked about some time ago, you can lessen the chance of vacuum damage by holding the toilet flush open during this process.

Also ask the driver not to use maximum suction.


Thanks so much
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Old 02-17-2019, 04:38 PM   #9
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Thanks so much


Do you have to order that valve from airstream ?
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Old 02-17-2019, 04:48 PM   #10
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Any plumbing supply and possibly big box like home depot. They are usually 1-1/2" pipe thread.


https://www.amazon.com/s/?ie=UTF8&ke...sl_3b6tzwwde_b
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Old 02-17-2019, 04:51 PM   #11
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Sewer smell under bathroom sink 25ft airstream international 2015

Make sure youve got some water in the P-trap for the bathroom sink per post #7 above....
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Old 02-17-2019, 05:17 PM   #12
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Along with the P-trap mentioned above, you also need to get your blank tank primed for the next use cycle, and make sure you have water in the toilet bowl to give you a water seal between the tank and bathroom.
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Old 02-18-2019, 06:30 AM   #13
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Along with the P-trap mentioned above, you also need to get your blank tank primed for the next use cycle, and make sure you have water in the toilet bowl to give you a water seal between the tank and bathroom.


Great ...all this helped tremendously
When you say black tank primed
What do you mean. I do understand the part about the water in the toilet
Also other than flushing out the black tank ... mine has an exterior hose connection that rinses the black tank ... is there anything else anyone does to clean the black tank
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Old 02-18-2019, 09:38 AM   #14
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Make sure youve got some water in the P-trap for the bathroom sink per post #7 above....
We get bad odors in our 2015 25FC from time to time, especially when running the bathroom or shower exhaust fan, the exhaust hood over the stovetop, or the Fantastic fan. Finally figured out that, yes, the bathroom sink is piped to the black tank. Also figured out that after long periods of storage with a dehumidifier running, water in the P-trap evaporates and the sink drain provides an unobstructed connection for vapors to be pulled out of the black tank into the trailer. Running a little water into the sink fixes this.
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