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Old 10-11-2018, 05:36 PM   #1
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Black tank flush

Does my black tank flush have a anti syphon back flow preventor ? I am trying to come up with an adapter so it would be safe to use with the fresh water hose. I have a 28.5 RSTS
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Old 10-11-2018, 05:55 PM   #2
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As far as I know, all 'recent' trailers come with them. Maybe someone out there knows when that started. Our 2015 has one.
What year is your RV?
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Old 10-11-2018, 06:05 PM   #3
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2018, where would it be ? When I unhook the water hose water flow's out of the flush fitting.
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Old 10-11-2018, 06:09 PM   #4
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It's inside the trailer. The water that runs out is what's left before the backflow.
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Old 10-11-2018, 06:24 PM   #5
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I will look tomorrow. Is it unsafe to use the same hose for the flush and fresh water if you have a back flow preventor ? I hate Rolling up an extra hose.
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Old 10-11-2018, 06:40 PM   #6
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It might be safe but I personally would never take that chance. My fresh water hose is for fresh water only. It really is not that much trouble to carry two hoses.
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Old 10-11-2018, 07:15 PM   #7
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Quote:
Originally Posted by Racinforthefinish View Post
It might be safe but I personally would never take that chance. My fresh water hose is for fresh water only. It really is not that much trouble to carry two hoses.
X2 I always run two hoses. If rolling is a pain get a coil hose for the black flush.
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Old 10-11-2018, 08:17 PM   #8
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If you look at page 3 of Today’s Posts there is a thread started by Jktb about this topic and leaks, “Black tank backflow preventer location”. He has the same model as you, only with bunks. I chimed in on it so please have a look at it.
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Old 10-11-2018, 09:28 PM   #9
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If you bought your trailer used it may have been disabled due to leakage. Mine was. The valve itself on mine was behind the shower faucet.
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Old 10-11-2018, 10:11 PM   #10
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I moved the anti-siphon back flow preventer to the outside of my trailer. I did not need water leaking into my rear storage compartment on my Jayco 23RB.
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