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Old 10-06-2019, 06:53 PM   #1
Rsc373
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Anti Siphon valve

Flushing the back tank this afternoon, and I hear the dreaded sound of falling water!!!! I look up to see water pouring out of the hole in the bathroom floor where the water pipes go up. I immediately shut of the water, been down this road before. So I get into the camper get the the flashlight open the drawer and yep the valve has failed again and is leaking water. Second time in 2 years, I take it all apart every thing seems okay, so I jump on Amazon to order a new one. But then I paused and decided to take off the cap, and guess what I see..... one of those stink bugs has found its way into to the inner guts and fouled it up. I tapped the valve a few times on the ground, bug falls out and crawls away!!! I put the valve back on tested it out, everything’s fine!!! Well not everything, had to empty the basement and clean up the water. But at least I still flushed out my tanks!!!!
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Old 10-06-2019, 07:14 PM   #2
jcurtis934
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That little leaked is why a lot of us connected the two pipes together with brass part and put the valve outside the rv.
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Old 10-06-2019, 10:31 PM   #3
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Originally Posted by jcurtis934 View Post
That little leaked is why a lot of us connected the two pipes together with brass part and put the valve outside the rv.
I like this idea, I think. Pictures please?
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Old 10-07-2019, 06:07 AM   #4
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Agree with Dick. It's an easy do it yourself job.
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Old 10-07-2019, 06:37 AM   #5
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Ditto

I had no idea that valve could be mounted outside in the convenience center. Pictures or directions would be great. Planning to replace black tank dump valve and cable next Spring and it'd be nice to replace my anti-siphon valve at the same time.
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Old 10-07-2019, 09:48 AM   #6
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Originally Posted by Mike3387 View Post
I had no idea that valve could be mounted outside in the convenience center. Pictures or directions would be great. Planning to replace black tank dump valve and cable next Spring and it'd be nice to replace my anti-siphon valve at the same time.
Just go to most hardware stores and get something like this: https://www.homedepot.com/p/Everbilt...-undefined-_-N

They're required in restaurant mop sinks etc. so they aren't rare.
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Old 10-13-2019, 03:44 PM   #7
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yep

Quote:
Originally Posted by jcurtis934 View Post
That little leaked is why a lot of us connected the two pipes together with brass part and put the valve outside the rv.
one of the first mods I did, cant imagine a new expensive camper with a flooded floor you'll never be able to completely repair. Makes you look bad in front of the wife to. yep you should have seen that coming .
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Old 10-06-2019, 07:35 PM   #8
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You are not the first to report a bug in the valve causing it to leak. They need to at least install a screen to prevent that. In addition to redesigning those valves so that they are not so prone to failure.
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Old 10-06-2019, 09:30 PM   #9
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On both Montys we removed the inside valve and went to using a metal one in the convenience center.
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Old 10-06-2019, 09:59 PM   #10
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Agree with Dick through that thing in the garbage and get one that goes on the outside!
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Old 10-07-2019, 08:09 AM   #11
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I did the bypass of the anti siphon valve behind the convenience center wall. If someone just looked into the storage bay or the bathroom sink, they would think everything is stock. I also use a brass anti siphon valve on the convenience center black water hookup. Easy mod.
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Old 10-07-2019, 09:18 AM   #12
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Here is a picture of mine after the anti siphon valve has been removed. I removed the valve and connected the lines back together. The pink in the lines is antifreeze as I had recently winterized the trailer. And the links below are examples of external anti siphon vacuum breaker valves.


https://www.lowes.com/pd/AMERICAN-VA...reaker/3353894


https://www.homedepot.com/p/Woodford...H-BR/204792578
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Old 10-07-2019, 10:06 AM   #13
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Just take it off and throw it away. You don’t need it. Connect the two pipes together and you will never have any more trouble with it.
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Old 10-13-2019, 08:36 PM   #14
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Originally Posted by mlh View Post
Just take it off and throw it away. You don’t need it. Connect the two pipes together and you will never have any more trouble with it.
Lynwood
The anti-siphon valve is there to prevent contamination of the fresh water system, not just your trailer, but the whole park. Backflow is serious business, little understood, and not the realm of shade-tree mechanics. Sorry to be blunt, but this isn’t the first time someone suggested “just take it off and throw it away”.
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Old 10-14-2019, 08:22 AM   #15
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head hurts

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The anti-siphon valve is there to prevent contamination of the fresh water system, not just your trailer, but the whole park. Backflow is serious business, little understood, and not the realm of shade-tree mechanics. Sorry to be blunt, but this isn’t the first time someone suggested “just take it off and throw it away”.
You can take it off and throw it away then connect the pipes together with a one way flow brass fitting brass fitting then put the back flow anti siphon fitting on the hose outlet in the conveyance center and this wont do any damage if it leaks, this is how I dealt with it.

Replace original plastic fitting with the stronger brass anti siphon valve but still risk the leak or potential flood in the camper

Although a code requirement in some states/counties especially with well systems my plumber says a backflow condition to the public water supply would be extremely rare and never heard of it happening in his 39 year career.

Or just cap the pipes off altogether under the sink with Shark Bites caps. Do you think that little nozzle in the tank really dose anything to clean out the tank any more than adding more water to the tank and dumping again which is what you should be doing anyway.
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Old 10-28-2019, 05:16 PM   #16
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Originally Posted by bshgto View Post
You can take it off and throw it away then connect the pipes together with a one way flow brass fitting brass fitting then put the back flow anti siphon fitting on the hose outlet in the conveyance center and this wont do any damage if it leaks, this is how I dealt with it.

Replace original plastic fitting with the stronger brass anti siphon valve but still risk the leak or potential flood in the camper

Although a code requirement in some states/counties especially with well systems my plumber says a backflow condition to the public water supply would be extremely rare and never heard of it happening in his 39 year career.

Or just cap the pipes off altogether under the sink with Shark Bites caps. Do you think that little nozzle in the tank really dose anything to clean out the tank any more than adding more water to the tank and dumping again which is what you should be doing anyway.
I do like the idea of using this style of vacuum breaker as opposed to the one that's in the unit.



However, wouldn't it make sense to put this on the end of the hose that attaches to the water supply side? That way, there is never any water that is spilled in the convenience center. And, if there was a sudden backflow condition, the breaker would pop, and no water should be pulled into the water supply. Maybe I don't understand the "fix" that was outlined in this post, and that's entirely possible.

ON EDIT: Actually, a fair number of the campsites that we've stayed at have these type of vacuum breakers on the water spigots already, and they are kind of a nuisance because they spew water all over you when you turn the faucet off. If I was to put one of these in the convenience center, I don't want that thing spewing water every time that I turn the hose off.

The one reason for leaving it in there is when you sell. I would be the prudent thing to make sure that the unit is to code when you sell it. If you kept the valve, you could always put it back together when you sold it.

As for just dumping (no pun intended) the power flush sprayer system all together, it does seem like something that should work fairly well, and at this point, I'm not game to disable the whole thing just quite yet...
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Old 10-28-2019, 06:17 PM   #17
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Originally Posted by CADman_KS View Post
I do like the idea of using this style of vacuum breaker as opposed to the one that's in the unit.
............
ON EDIT: Actually, a fair number of the campsites that we've stayed at have these type of vacuum breakers on the water spigots already, and they are kind of a nuisance because they spew water all over you when you turn the faucet off. If I was to put one of these in the convenience center, I don't want that thing spewing water every time that I turn the hose off.
............
Newer codes adopted by many areas now require those anti siphon valves on all outdoor faucets. Our house was built without them. But several years later I had to have an outdoor faucet replaced. And new code required the replacement to have the anti siphon device. That one does leak a little at very low pressure but immediately stops when pressure increases even a little. And never sprays. If I open the faucet quickly it doesn’t even leak.

The valve would serve the purpose at either location. Just personal preference. Mine goes in the CC and doesn’t leak or spray.

I very much believe in the flush system. I drain my tank and start the flush. With the flush running I close the drain valve for about one minute, open the valve and drain, close the valve for one minute, open the valve and drain, repeat until water coming out is relatively clear. Typically lots of extra “stuff” comes out the first time or two.
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Old 10-28-2019, 06:21 PM   #18
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Quote:
Originally Posted by CADman_KS View Post
I do like the idea of using this style of vacuum breaker as opposed to the one that's in the unit.



However, wouldn't it make sense to put this on the end of the hose that attaches to the water supply side? That way, there is never any water that is spilled in the convenience center. And, if there was a sudden backflow condition, the breaker would pop, and no water should be pulled into the water supply. Maybe I don't understand the "fix" that was outlined in this post, and that's entirely possible.

ON EDIT: Actually, a fair number of the campsites that we've stayed at have these type of vacuum breakers on the water spigots already, and they are kind of a nuisance because they spew water all over you when you turn the faucet off. If I was to put one of these in the convenience center, I don't want that thing spewing water every time that I turn the hose off.

The one reason for leaving it in there is when you sell. I would be the prudent thing to make sure that the unit is to code when you sell it. If you kept the valve, you could always put it back together when you sold it.

As for just dumping (no pun intended) the power flush sprayer system all together, it does seem like something that should work fairly well, and at this point, I'm not game to disable the whole thing just quite yet...
You will change your mind about the valve when you have water flowing out the entry door when you open it.
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Old 10-28-2019, 06:53 PM   #19
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Originally Posted by CADman_KS View Post
...
The one reason for leaving it in there is when you sell. I would be the prudent thing to make sure that the unit is to code when you sell it. If you kept the valve, you could always put it back together when you sold it.

...
This paragraph should have said:

The one reason for putting it back in there is when you sell. It would be the prudent thing to make sure that the unit is to code when you sell it. If you kept the valve, you could always put it back together when you sold it.
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Old 12-05-2019, 07:10 AM   #20
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Originally Posted by CADman_KS View Post
I do like the idea of using this style of vacuum breaker as opposed to the one that's in the unit.



However, wouldn't it make sense to put this on the end of the hose that attaches to the water supply side? That way, there is never any water that is spilled in the convenience center. ...

If I was to put one of these in the convenience center, I don't want that thing spewing water every time that I turn the hose off.

...
On our last outing, I put the vacuum breaker in the convenience center. As suspected, when the water shut off, I had water everywhere in there.

I'm going to move the vacuum breaker to the outside at the water supply, and bypass the vacuum breaker inside with a couple of 90's. That way, we are still legal as far as water backflowing into the supply side...
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