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Old 09-19-2018, 07:35 PM   #1
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black flush valve leak

The little valve inside my trailer's rear locker may be a back flow preventer but I'm not sure. It is rectangular black plastic thing. Anyway, It always leaks a little which seems to occur when I shut off the water to the black tank flush. Only a dozen or less drops but enough to cause moisture in the locker which rusted my cooking grill I kept in the locker.

Is the valve really necessary? Any suggestions to stop that little leak?

I've learned a lot from this forum but always seems like I have questions and no answers for other's questions.
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Old 09-19-2018, 07:47 PM   #2
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As far as I know, the back flow preventer is required to be installed by the manufacturer, but you are not legally required to keep it.

Is it necessary? That was debated here not long ago with no consensus reached.

You could replace the valve to stop the leak.

Another possibility would be to wrap the valve in a towel to stop the drip. The towel would absorb the drips and they would evaporate. Of course that would not work if the valve develops a serious leak.


Hope something helped.
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Old 09-19-2018, 08:41 PM   #3
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One of the first things I get rid of. In my experience they are always going to leak. It’s one of the firsf things I delete on a new RV for that very reason; leaks.
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Old 09-19-2018, 09:09 PM   #4
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Thanks. May just remove it.
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Old 09-20-2018, 03:39 AM   #5
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Mine leaked. Fortunately, mine was located in the large rear storage compartment on my 23RB, and not inside the trailer, especially in a hard to reach area.

I took mine out because I did not want another water leak inside my trailer.

I understand their purpose, which is to prevent any contaminated black water to back flow into the public water system. So I bought a back flow preventer that attaches to the black flush water hose on the exterior of the trailer. Best of both worlds now, I believe.
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Old 09-20-2018, 07:36 AM   #6
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I took mine out and replaced it a 90* sharkbite fitting. I removed the old exterior entry and replaced it with one that has a backflow device similar to a city water connection.
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Old 09-20-2018, 05:11 PM   #7
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My trailer is the 23rb also. will get connectors from the dealer to do as you did. Don't understand why they would install a unit that is apparently designed to leak inside the trailer.
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Old 09-20-2018, 05:50 PM   #8
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That's how poor the design of the backflow preventer is. Please let me know where it is manufactured.

Now the truth of the story by removing it the following can happen. If you use it at home with a tap which have no vacuum breaker, and the water is suddenly turned off and drained. It will created a vacuum in your household water system, which also will suck on your hose connected to the black-flush system. Do I have to tell more?

Yes you get the mush from your Black-tank in your freshwater system of your home.

So for the bright ones that will say it will not happen to them...…..yes it does.
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Old 09-21-2018, 04:10 AM   #9
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May want to check the fittings around the valve. After a year of use, I noticed that I had a leak during a BW flush. Checked the fittings inside and they had worked loose. Snugged them up...no leaks. Added that you my annual maintenance list. These TT experience a lot of vibe going down the road, best to periodically check and retorque anything that has a threaded interface.
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Old 09-21-2018, 09:34 AM   #10
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will do that before I do any surgery
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