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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, everythingís 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, 07:35 PM   #3
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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   #4
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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   #5
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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 10-06-2019, 10:31 PM   #6
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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.
I like this idea, I think. Pictures please?
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Old 10-07-2019, 06:07 AM   #7
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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   #8
Mike3387
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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, 08:09 AM   #9
RoadRunnerTR21
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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   #10
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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, 09:48 AM   #11
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Quote:
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 10-07-2019, 10:06 AM   #12
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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 10-07-2019, 03:47 PM   #13
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Lose it!

Took mine out and hooked the pipes together in the bay where the stubbed up under the sink. Mine is a 3150 RL 2014. On mine I noticed that the hose connector in the convenience center was also an anti siphon or backflow preventer. So I feel safe just hooking the water straight to mine. Just remember to winterize that one in freezing temps.
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Old 10-07-2019, 04:27 PM   #14
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Quote:
Originally Posted by DQDick View Post
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.
The model vacuum breaker you show a link to could have a problem. If you ever had a full tank and either stopped quickly or in some other way managed to get fluid in the pipe all the way from the black tank to that particular valve it could siphon into the area you installed it. Especially if your flush line is the same level from the tank to the valve. You will notice the vent (holes) are on the side of the valve that is open to atmosphere and on the side going to the black tank. While you would not get a siphon into the female side of the valve it could be possible to get flow on the male side. That is the reason the OEM vacuum breaker is mounted up much higher than the tank to prevent a siphon from occurring.
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Old 10-07-2019, 05:28 PM   #15
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Two things to remember. First the high cross over were the breaker was is still there so you would have to overflow the tank and the stool to get that to work. Second, I install mine with a quick disconnect and when I'm not dumping there is a plug in place of the breaker.
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Old 10-07-2019, 07:24 PM   #16
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A third thing is that the flush connection in the convenience center is higher than the tank that is below floor level. It can’t siphon uphill.
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Old 10-13-2019, 02:36 PM   #17
Bill M
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My question to this issue: why is this happening? I run a seperate hose from the spicket to the tank flush & have never had a problem. Am I just lucky or have I seperated the system that prevents water backup to the cheap plastic parts?
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Old 10-13-2019, 03:44 PM   #18
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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 10-13-2019, 05:49 PM   #19
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Winterize Flush Line

Quote:
Originally Posted by Sdgood1 View Post
Took mine out and hooked the pipes together in the bay where the stubbed up under the sink. Mine is a 3150 RL 2014. On mine I noticed that the hose connector in the convenience center was also an anti siphon or backflow preventer. So I feel safe just hooking the water straight to mine. Just remember to winterize that one in freezing temps.

How do you force antifreeze into the black flush line?
Did you mount an back siphon valve in the convenience center on the flush line or behind the convenience center?
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Old 10-13-2019, 07:36 PM   #20
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Originally Posted by glendodom View Post
How do you force antifreeze into the black flush line?
Did you mount an back siphon valve in the convenience center on the flush line or behind the convenience center?
When winterizing and you run the outside shower until you see pink stuff come out the shower hose, just connect the shower hose to the flush connection and run antifreeze thru that line.

The anti siphon valves in the links above have garden hose type fittings and can be connected directly to the external flush connection at the front side of the convenience center.
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