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Old 06-24-2016, 05:19 PM   #1
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Black tank flush back flow valve

Factory back flow (or whatever its called) leaked. Replaced it with a nice brass one that was recommended on here. It leaks too.
I have read the discussions about these on here but I still don't understand why it is needed. My black tank flush line isn't tied into my fresh water plumbing in any way. The only way I see it could possibly flow back would be if the water hose was hooked to it, water cut off and black tank valve closed and somehow water was still entering the black tank. I am wondering why I can't just remove the valve.

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Old 06-25-2016, 09:17 AM   #2
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No thoughts or opinions on this?

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Old 06-25-2016, 11:45 AM   #3
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Lots of people do remove it but usually do not admit it as it is a required device by RV regulation........if you remove you can always use one at the hose end....


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Old 06-25-2016, 12:04 PM   #4
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Quote:
Originally Posted by howie70 View Post
Factory back flow (or whatever its called) leaked. Replaced it with a nice brass one that was recommended on here. It leaks too.
I have read the discussions about these on here but I still don't understand why it is needed. My black tank flush line isn't tied into my fresh water plumbing in any way. The only way I see it could possibly flow back would be if the water hose was hooked to it, water cut off and black tank valve closed and somehow water was still entering the black tank. I am wondering why I can't just remove the valve.

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it there for the slight chance of back flow into the water supply system !
i would dump the back flow and just get a check valve . no leak and no fuss and you'll be safe just in case that one in a million thing happens what ever that is
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Old 06-25-2016, 12:53 PM   #5
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backflow preventer

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Originally Posted by northstar1960 View Post
it there for the slight chance of back flow into the water supply system !
i would dump the back flow and just get a check valve . no leak and no fuss and you'll be safe just in case that one in a million thing happens what ever that is
the backflow preventers that are installed on your hose bibs at your house all also drip a bit of water every time they are turned off.

If it is located outside your RV and/or inside the water compartment on the outside it does no harm at all when this happens. The drip simply runs out the bottom or evaporates.

Their purpose is to prevent a siphon from forming and sucking contaminated water back into yoru rv system or the system at the park or house you are hooked up to.

My advise is to leave it installed. Your safety and teh safety of others could easily be at stake!
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Old 06-25-2016, 12:56 PM   #6
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Northstar is correct. It's job is to prevent contamination of the source water i.e. the campground's water system that supplies all the sites.

I use the little brass one that Fonzie provided a link to. The previous owner of my TT removed the factory-installed plastic one and installed a plastic 90 degree bend in it's place. So I use the brass one on the end of my dedicated flushing hose.

If you opt to remove it, please do not hook up to your black tank flusher without some kind of backflow preventer/check valve on your hose. And don't use your white city water hose - get a dedicated regular garden hose for that job.
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Old 06-25-2016, 01:02 PM   #7
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I get strange looks when I break out an old white camp hose to flush my tank. Those giving me those looks probably don't see the several black spray painted areas along that hose. I am not going to throw away a good hose just because it's not the right color.
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Old 06-25-2016, 02:13 PM   #8
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Quote:
Originally Posted by northstar1960 View Post
it there for the slight chance of back flow into the water supply system !
i would dump the back flow and just get a check valve . no leak and no fuss and you'll be safe just in case that one in a million thing happens what ever that is
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Old 06-25-2016, 08:33 PM   #9
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Quote:
Originally Posted by DouglasReid View Post
the backflow preventers that are installed on your hose bibs at your house all also drip a bit of water every time they are turned off.

If it is located outside your RV and/or inside the water compartment on the outside it does no harm at all when this happens. The drip simply runs out the bottom or evaporates.

Their purpose is to prevent a siphon from forming and sucking contaminated water back into yoru rv system or the system at the park or house you are hooked up to.

My advise is to leave it installed. Your safety and teh safety of others could easily be at stake!
Well this one drips inside my bathroom cabinet. That is unacceptable. And as far as contaminating my campers fresh water..... I say it can't happen. It is not connected any way shape or form to my fresh water system. I can see where there is a very very slight chance of back flow into the supply hose. Think I will go with Fonzie's recommendation.

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Old 06-25-2016, 09:45 PM   #10
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Quote:
Originally Posted by DouglasReid View Post
the backflow preventers that are installed on your hose bibs at your house all also drip a bit of water every time they are turned off.

If it is located outside your RV and/or inside the water compartment on the outside it does no harm at all when this happens. The drip simply runs out the bottom or evaporates.

Their purpose is to prevent a siphon from forming and sucking contaminated water back into yoru rv system or the system at the park or house you are hooked up to.

My advise is to leave it installed. Your safety and teh safety of others could easily be at stake!
The anti siphon hose bib on the house are not the same as in these RV's .
these should not drip or leak if they do they need replaced . if a siphon is created it should only allow air in to break the siphon
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