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Old 03-01-2019, 09:46 AM   #1
Hamlej
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Anti siphon valve

I had water dripping from the belly of our 3820FK, when I removed a couple of panels in the basement while searching for the source, I discovered about 2 inches of standing water on top of the coroplast. In our model the ant siphon valve is located in the kitchen under some drawers and that was the source of the leak, with a slow drip from the top of the valve. I’ve read that these valves are cheap and typical builders crap so I ordered and installed a Valterra valve and it’s doing the same thing. What am I missing or what would cause this.
 
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Old 03-01-2019, 10:11 AM   #2
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It may not be the valve that is leaking. It could be the fitting on the end of the line that attaches to the valve. Normally a male fitting on both ends. Could have a manufacturing defect or could have hair line crack from over tightening. If you have enough slack the fittings are easy to replace.
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Old 03-01-2019, 11:31 AM   #3
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The anti siphon valve should only leak, if it leaks, while you are running the black tank flush. It should be located at the highest place in that pipe run. And is only pressurized when flushing. When not flushing, it has an atmospheric vent to relieve any pressure in the line and drain the water into the tank. Is it a continuous drip even when not flushing?
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Old 03-01-2019, 12:04 PM   #4
Hamlej
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Thank you for the replies, I tend to learn by the school of hard knocks. I caused the valve to drip because of leaving the hose connected after flushing. The inline on/off valve on the hose was not shutting off completely after black tank flush, leaving a slight but constant water pressure in the hose. Lesson learned, disconnect hose. It’s Magic the leak is gone.
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Old 03-01-2019, 04:00 PM   #5
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Many of us have removed that valve altogether and use an external valve instead. That way any issues are outside of the rig.
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Old 03-01-2019, 05:31 PM   #6
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Quote:
Originally Posted by Hamlej View Post
I had water dripping from the belly of our 3820FK, when I removed a couple of panels in the basement while searching for the source, I discovered about 2 inches of standing water on top of the coroplast. In our model the ant siphon valve is located in the kitchen under some drawers and that was the source of the leak, with a slow drip from the top of the valve. I’ve read that these valves are cheap and typical builders crap so I ordered and installed a Valterra valve and it’s doing the same thing. What am I missing or what would cause this.
had the same leak problem. I used a "white" PVC thread sealer. put on very little it doesn't take much to seal PVC threads. And don't over tighten.
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Old 03-01-2019, 08:34 PM   #7
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Did the same as DQDICK! Then you will never have a problem aging.
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Old 03-01-2019, 10:06 PM   #8
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X3 with DQDick and BuilderBob.
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Old 03-02-2019, 05:01 AM   #9
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Did the same as DQDICK! Then you will never have a problem aging.
Well shoot I am doing this since I do not want any issue with aging!!!!

Sorry I have fat fingers also and pulled worse ones.
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Old 03-02-2019, 10:43 AM   #10
Hamlej
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B

What did you use and where did you mount external valve?
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Old 03-03-2019, 08:09 AM   #11
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My anti siphon valve was in the wall behind shower, removed it along with the pex water lines(15 ft). Connected the line direct to the flusher. Bought and installed a backflow preventer valve on the flushing connection. Cost $5-10.
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Old 03-03-2019, 02:45 PM   #12
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What did you use and where did you mount external valve?
Bought one with hose fittings at Home Depot. Connect it at the flush connection.
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Old 03-06-2019, 02:43 PM   #13
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I can't think of the name of mine but is was black. I've replaced it twice. Just had to call the manufacturer and they sent me new one's. NO charge.
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Old 03-06-2019, 02:46 PM   #14
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This is the one I have and the manufacturer replaced it twice for me at no charge. All you need to do is call them.

https://www.amazon.com/JR-Products-5...81563002&psc=1
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Old 03-06-2019, 02:51 PM   #15
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I had the same problem in our new 2010 Montana about the 2nd time we used it. I have a 6 foot hose connected to my backflush inlet connection in the convenience center. Outside I connect a wye to that hose and then connect a longer hose that runs to the pedistal faucet. When done flushing, I shut off the wye, then open the unused part of the wye to let the water drain out of the 6 foot hose. It quickly releases the inline pressure pushing against the anti-siphon valve. If you don't release the pressure, the pressure will slowly subside releasing the spring in the anti-siphon valve and will release water into the area where the valve is located. There was nothing wrong with your initial valve. Mine was releasing water on the floor in the bathroom vanity which followed the pipes into our garage. i've been doing this for 10 years and not a drip since. The anti-siphon valve is there for a purpose - to prevent contamination of the fresh water supply.
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Old 03-06-2019, 02:56 PM   #16
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Remove the BS government required valve and plumb the 2 lines together in the basement before you ruin your camper !!!!!! IMHO they are not needed AT ALL and are a ticking time bomb waiting to go off at any time. You more that likely already have some wet wood from the waters path unto the coroplast.
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Old 03-06-2019, 03:11 PM   #17
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I don't know Y you guys don't just do like most of us have all ready done and just eliminate the dam thing so you don't have the problem any more! How meany times are you going to replace it? with the same peace of junk.
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Old 03-06-2019, 03:27 PM   #18
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Some of us have replaced it with a brass one
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Old 03-06-2019, 04:05 PM   #19
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Quote:
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Some of us have replaced it with a brass one
Yep, and the check valve is not even needed.
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Old 03-06-2019, 04:22 PM   #20
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I found a couple 1/2" sprinkler fittings at Home Depot, screwed them together and installed them. Total cost was a couple bucks vs about $30 to replace in kind. No more occasional odor and no chance of a leak,


If these are needed for a 'vacuum' breaker, then why the roof mounted vent. I can't see any chance of any tank vacuum if that roof vent is clear. I don't recall our last 5er, a Canadian built Titanium or the two TTs preceding it or even the old Newmar Kountry Aire having one of these gadgets - and ya gotta believe I worked on every piece of plumbing at one time or another on them
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