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Old 10-18-2020, 04:28 PM   #1
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Black tank flush

I was dumping my black tank for my final trip of the year this morning and decided to use the blank tank flush for the first time on our trailer . Itís a 2017 Forest River Vibe 268RKS and I wanted to make sure nothing was left . Unfortunately my wife noticed water coming out from under the vanity which is just behind where the flush valve is . Does anybody have any ideas or experience with this ?
Thanks
Mike
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Old 10-18-2020, 04:37 PM   #2
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Most likely it's the syphon breaker leaking which is really common, Many threads on it lately,
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Old 10-18-2020, 04:51 PM   #3
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Thanks for the reply . Is it something I can replace?
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Old 10-18-2020, 04:59 PM   #4
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You can replace it with another cheap plastic valve that will also break or spend more and buy a quality brass Watts LF288A.
https://www.watts.com/products/plumb...reakers/lf288a

The alternative is a hose bibb vacuum breaker on the hose outside.
https://www.homedepot.com/p/Everbilt...Z4EB/205815672

Please be sure to use one and not just put a 90 deg elbow in and not use a vacuum breaker valve. Theyíre required by code.
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Old 10-18-2020, 05:13 PM   #5
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They are easy to replace but some people have a time getting to it. It's usually up behind the sink bowl. They have to be at least 6 inches above the height of the toilet bowl. They are usually black and can become stuck open allowing water to leak and a sharp bump can dislodge the stuck flap so you don't need to replace them. They are directional so be sure you install it the correct direction. The first picture is a common one and some people replace them with a brass one like in the second picture. The black pipe to the right in the second picture is the air admittance valve for the grey water tank, they sometimes stick so the sink doesn't drain properly, a rap with a screwdriver handle will free it.
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Old 10-19-2020, 02:38 PM   #6
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cool info for later
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Old 10-19-2020, 05:08 PM   #7
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I had this same experience this past week. I removed the vacuum breaker valve and found that 5 stink bugs had crawled into it for the winter. I removed them and cleaned the valve and reinstall it. Before I reinstalled it I zip tied fine black netting around the top to prevent the unwanted critters from getting in there again.
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Old 10-24-2020, 09:22 AM   #8
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Quote:
Originally Posted by Mike72 View Post
I was dumping my black tank for my final trip of the year this morning and decided to use the blank tank flush for the first time on our trailer . It’s a 2017 Forest River Vibe 268RKS and I wanted to make sure nothing was left . Unfortunately my wife noticed water coming out from under the vanity which is just behind where the flush valve is . Does anybody have any ideas or experience with this ?
Thanks
Mike

If your going to replace go with itat's suggestion of
https://www.watts.com/products/plumb...reakers/lf288a


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Old 10-24-2020, 09:28 AM   #9
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Quote:
Originally Posted by campers302 View Post
If your going to replace go with Mike72 suggestion of
https://www.watts.com/products/plumb...reakers/lf288a


I thought Mike72 asked the question.
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Old 10-24-2020, 10:02 AM   #10
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Quote:
Originally Posted by Mr. Dan View Post
I thought Mike72 asked the question.

Thanks . Delayed roll on the
page cause me to look at the wrong name.
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