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Old 09-22-2014, 10:20 PM   #15
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Here is a link to similiar conversation Black Water Tank Odor Good luck!
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Old 09-23-2014, 10:39 AM   #16
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If you have a Washer/Dryer, you might check the standpipe vent behind the washer. These are known to smell if the washer is not used a lot. I used plumbers putty and stuffed it around the drain hose at the top of the pipe. That did the trick.
For long term storage or infrequently used p-traps fill them with mineral oil or a cooking oil. They won't evaporate or freeze and are more resistant to siphoning.
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Old 09-23-2014, 11:02 AM   #17
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We have to rinse cycle our Washer Dryer every so often because the Trap water evaporates if not used. Smells just like black tank.
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Old 09-23-2014, 11:25 AM   #18
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^^^^ what they said --- two sinks in the baths and we rarely use one of them so p-trap water all evaporated out - phew


AMAZING how that grey water can smell !


asked the grand daughter if she 'popped a squat' (her term) in the sink
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Old 09-23-2014, 11:29 AM   #19
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Mechanical Air Vents may need to be replaced.

Two examples below. I like the ones made by Studor (first two photos), more expensive but worth the extra cost.

Dr4Film ----- Richard
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Old 09-23-2014, 04:31 PM   #20
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If you don't have a washer/dryer check the connection for the washer drain. My coach stunk when new until I noticed there was no cap on the drain to the tank was not capped/closed. There should be an access panel in your washer cabinet

Mike
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Old 09-23-2014, 07:18 PM   #21
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Thanks for the pictures of the valves in your vanities Dr4Film! I know that they will help lots of folks to understand the situation. Best wishes
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Old 09-23-2014, 09:34 PM   #22
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One other item worth mentioning... if the smell is like rotten eggs, check your batteries. Batteries that have boiled dry are very smelly.
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Old 09-23-2014, 11:51 PM   #23
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thank you everyone!! i have learned a lot
my problem appears to be different... i am sure the smell comes from restroom under the sink, and it is from gray tank, but with a brand new air admittance valve (bought from home depot STUDOR, Redi-Vent with PVC Adapter Valve, 20353 at The Home Depot - Mobile), the smell refuses to go away. now i have to stop using the grey tank after dumped it. as the last resort, when i have enough tools (i am still on the road), i will probably tear the bottom carpet/board of the under sink to see what are there.

sarah, the smell is kinda fishy, not a typical smell from black tank nor rotten egg; but we hadn't cooked seafoods
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Old 09-24-2014, 12:17 AM   #24
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Try treating the grey tank with Happy Campers to see if the smell subsides.

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Old 09-24-2014, 12:33 AM   #25
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Try treating the grey tank with Happy Campers to see if the smell subsides.

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i thought that as well but i could only order it from online and no place i could have them ship to for we are on the road.. by the way that would only be a temp solution, i still need to find out the root cause.
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Old 09-26-2014, 10:44 PM   #26
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I am southern Nevada this week, heading for Arizona next week. This afternoon I went to the bathroom to wash my hands. What a smell I got! Rembering this thread, I looked under the sink, but I do not have an air admittance trap like the ones mentioned here. The sink drain went down and the vent went up out of sight. I understand the P-trap getting dried out...makes sense. But once the trap gets filled with water, where does the smell come from?
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Old 09-27-2014, 12:16 PM   #27
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I am southern Nevada this week, heading for Arizona next week. This afternoon I went to the bathroom to wash my hands. What a smell I got! Rembering this thread, I looked under the sink, but I do not have an air admittance trap like the ones mentioned here. The sink drain went down and the vent went up out of sight. I understand the P-trap getting dried out...makes sense. But once the trap gets filled with water, where does the smell come from?
You also may have p-traps in the shower drain and washer/dryer drain in the area.
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Old 09-27-2014, 03:03 PM   #28
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You also may have p-traps in the shower drain and washer/dryer drain in the area.
hi dean, nice hearing from you... do you know where the p-trap for w/d is at? i suspect the gremlin plays in my part if the event is also in below restroom sink cabinet
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