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Old 04-22-2012, 05:23 PM   #11
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I had this on the last trailer we had turned out to be the internal vent under the bathroom sink, find it and unscrew it and watch the water drain.
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Old 04-22-2012, 05:26 PM   #12
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I had this on the last trailer we had turned out to be the internal vent under the bathroom sink, find it and unscrew it and watch the water drain.

BINGO! I think this is the issue. See my post on Air Admittance Valves.
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Old 04-23-2012, 11:45 PM   #13
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Do the shower drains have check valves on them? If so, would it be possible that it was installed backwards? If it is plugged with debris, what would one use to free it up? Would just a standard snake for sewer lines do the job? And Rod, I am not sure what exactly you are asking....this is just in a shower, no plug for a tub.
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Old 04-23-2012, 11:55 PM   #14
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Herk, I just looked under my sink, and there doesn't appear to be anything that you have posted on your link from your last post. There is a black box under the sink that is just below the sink drain, not sure what that is. I do have 2 vents on the top of the trailer I am presuming they are for a vent of some sort as well.
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Old 04-24-2012, 12:30 AM   #15
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And Rod, I am not sure what exactly you are asking....this is just in a shower, no plug for a tub.
Ohh, okay.

My shower has a pop up stopper in it. I think you're supposed to pop it down during storage to help keep smells out.
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Old 04-24-2012, 09:57 AM   #16
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Herk, I just looked under my sink, and there doesn't appear to be anything that you have posted on your link from your last post. There is a black box under the sink that is just below the sink drain, not sure what that is. I do have 2 vents on the top of the trailer I am presuming they are for a vent of some sort as well.
Robin,

A photo will help us. The two roof vents are for your holding tanks.
An Air Admittance valve looks like this. It is most likely located under the bathroom sink for the shower drain.

There could also be rubbish in the trap. Access to the trap would be from a storage compartment (perhaps behind a false wall.
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Old 04-24-2012, 08:02 PM   #17
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Hey all, took the false wall down this morning, and found out the check valve was put in backwards. Re-plumbed and now everything is good to go. Thanks everyone.
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