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Old 03-31-2019, 01:35 PM   #1
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MBS 2016 Black Tank Scrubber

Hello
The other day after dumping black and then grey tank we hooked up the hose to the black tank scrubber.
Have done this for the past 3 years and it does a great job of getting the side walls cleaned.
This time Low and Behold we were greeted with water blowing out of the air vent under the bathroom sink and no sound from the internal scrubbers.
Yes discharge valve was open but nothing came out only clear water from the air vent.
Curious if any of my fellow Glampers can give me some pointers of why and possible corrections
Thank Y'all in advance and safe travels

Steve
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Old 04-01-2019, 12:12 PM   #2
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That air vent is the backflow/anti-siphon device for the tank rinse. They fail pretty often.

Does it look something like this?

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Old 04-01-2019, 12:15 PM   #3
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air vent on MBS

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Originally Posted by Bama Rambler View Post
That air vent is the backflow/anti-siphon device for the tank rinse. They fail pretty often.

Does it look something like this?

Yes looks the same but black
Would that cause the problem ??
Thanks for your feedback
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Old 04-01-2019, 12:17 PM   #4
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replacement of air vent

Any ideas where I can purchase a new one
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Old 04-01-2019, 01:09 PM   #5
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That one is from Amazon It's a Valterra A10 3050
Most RV places will have them too.
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Old 04-05-2019, 11:45 PM   #6
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How/why is the bathroom sink connected to the black tank not the gray tank?
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Old 04-06-2019, 01:10 PM   #7
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How/why is the bathroom sink connected to the black tank not the gray tank?

I'd guess a shorter line to the tank and likely easier to install.
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Old 04-08-2019, 09:27 PM   #8
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Perhaps but usually the bathroom sink is quite close to the shower...

Itís not a bad thing and could be a good thing for adding more water to the BW tank. Itís just something an owner would kind of like to know.
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Old 04-08-2019, 10:42 PM   #9
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Perhaps but usually the bathroom sink is quite close to the shower...

Itís not a bad thing and could be a good thing for adding more water to the BW tank. Itís just something an owner would kind of like to know.

I would think that the amount of water from the sink would not be much as compared to the shower - kind of a nit as to overall volume of water going into the black tank.
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Old 04-09-2019, 12:57 AM   #10
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I would think that the amount of water from the sink would not be much as compared to the shower - kind of a nit as to overall volume of water going into the black tank.
If the bathroom sink and shower are both drained to the black tank, then there would be very little need for the gray water tank (kitchen sink...). I would think in the vast majority of cases, the shower is routed to the gray water tank.
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