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Old 05-17-2021, 05:26 AM   #21
Sonders
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Quote:
Originally Posted by jxnbbl View Post
So it didn't work ( I created one that I could screw on/detach) instead of the putting the trailer in storage on our return going back to the dealer to deal with it. I'm betting that it was never hooked up at the tank and has a plug in it.
mine doesn't work on my 2015 Passport Ultra Lite either. I have another thread on it as well. I talked to Chucky on here to troubleshoot and I can trace the pex line all the way to where it runs under the floor. We concluded that mine is probably pinched under the floor where it goes into the tank.

Like you, I removed the stock anti-siphone valve and replaced it with no luck. MIne would just build up with pressure. I tried running water, as well as hooking up air line and trying to push air through it with no luck.

I haven't had time to drop the duraplast liner underneath to look at the black tank yet to try and fix.
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Old 06-02-2021, 06:38 PM   #22
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Originally Posted by Javi View Post
It is a cheap piece of junk that every trailer owner will have to replace.

It is an anti-siphon valve, its purpose is to prevent water from the black tank being sucked into the camp water system when you use the flush system.

The simple solution is to replace it with two 90` elbows and a short piece of PEX and a hose bib anti-siphon valve on the water hose.. the complicated solution is to buy a brass anti-siphon replace and wait for it to also leak..

https://www.amazon.com/Eastman-20199...79539603&psc=1
Older thread but I had it saved as I wanted to replace the cheap plastic anti- siphon valve with the 'simple solution' Javi described. I do not have an issue with my black tank flush not working but wanted to prevent any leak/flood in the future.

Anyway, I purchased the parts and had a look under the bathroom sink to check it out and I do not see an anti-siphon valve. My two PEX lines run straight up unimpeded to the faucet. The only thing I see aside from the drain pipe/P-trap with usual fittings is an air admittance valve.

Possible it was installed behind a wall somewhere?!?
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Old 06-02-2021, 07:40 PM   #23
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It's not one of the two pipes that feed your sink, it's usually a third, independent pipe that runs through the same cabinet. Looks like in your rig, the sink isn't installed in the same vicinity as the outdoor flush line, so the line doesn't share the cabinet... either that, or you need to look to both sides of that cavity and not directly at the sink bowl.
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Old 06-03-2021, 02:54 AM   #24
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I have read of a few folks that have found it in the shower wall. It just depends on the location of the water input, the blank tank, and what's in between.
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Old 06-17-2021, 04:47 AM   #25
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followup on "flush not working"

Quote:
Originally Posted by jxnbbl View Post
So it didn't work ( I created one that I could screw on/detach) instead of the putting the trailer in storage on our return going back to the dealer to deal with it. I'm betting that it was never hooked up at the tank and has a plug in it.

A followup on this...


In summary: The black tank flush has never worked on my camper, I plumbed a bypass for the anti-siphon device (that screwed on to existing fittings...so it is removable) still didn't work. Decided since it was new to bring to dealer.


Trip 1: I waited and they said they built up the pressure and it started working. I went over it with the tech and he said it was plugged with crap (he believes). Highly doubtful due to our use and monitoring of the tank...i don't think it ever went to 1/2 capacity and was always empty when driving. Loaded up went home parked it and decided to give it a try. Didn't work.


Ended up creating a cell phone video using my regulator valve psi as evidence that at 40 psi (max I can get at end of hose) it does not work....


Trip 2: left it as I wasn't going fool with the underbelly, insulation, cutting holes from above, removing tank....whatever it took to get to the tank connection.


Results: - they found that the ptex was crimped. We believe that since they can crank up the water psi to say 60 - it probably works at that pressure...but not at lower pressures commonly seen. Getting warranty repair approval, but it is a simple fix of cutting the ptex and inserting an elbow to make the right angle they created when they crimped the hose between the floor and the tank.
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Old 06-17-2021, 06:59 AM   #26
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JXNBBL,

If you look at the white tube that is attached to the back part of the black tank in this photo, you will see how the factory installs the "black tank flush PEX line" .... If you consider that once this tank is placed in position between the frame rails and the white PEX line is pulled up, into the trailer interior (so it fits in place under the vanity sink), it's pretty easy to understand why there are a lot of trailers with "crimped blackflush lines".... It doesn't make it "right", just explains why it happens when they aren't paying attention to what they're doing in Goshen.....
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Old 06-17-2021, 01:35 PM   #27
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Thanks for the picture...i suspected something like that but it is all hidden.
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Old 06-17-2021, 02:47 PM   #28
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This is where our valve is located, between the shower and the pantry wall. We've been fortunate, been using the flush weekly since the trailer was new, and we full time. It is technically an anti siphon/vacuum breaker. When I flush our tank, after the flushing is complete, water drains out the hose connection from where the valve is and also water on the other side drains into the black tank. This is a brass version of the valve, which I suspect would hold up much better, but in areas where the trailer has to be winterized, the water in the line should be drained and then maybe blown out. Antifreeze will not stay in the lines, so would not work well. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 06-18-2021, 03:01 AM   #29
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Originally Posted by bobbecky View Post
... This is a brass version of the valve, which I suspect would hold up much better, but in areas where the trailer has to be winterized, the water in the line should be drained and then maybe blown out. Antifreeze will not stay in the lines, so would not work well. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Actually I have houses, boats and now a trailer that has to be winterized. This is a common misconception with winterization....the red RV antifreeze does not have to stay in the lines, but water can not. For something like this I would usually use a compressor set at 40# or so and blow out the water into the tank and then pump some antifreeze through the line.



Last winter due to my problem (kink in line so no flow past the valve) I disconnected the antisiphoning device, blew out the line from connection to the valve, stuck a 'snake' down the line to displace water, and filled with antifreeze with a funnel.


I didn't have time to deal with this back then...but probably should have in retrospect.
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