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Old 12-17-2012, 01:40 AM   #1
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I'm having intermittent problems with the backflow valve leaking on the black tank flush line. The valve is located in the bathroom sink cabinet and creates a wet mess. I've never had this type of valve on any other RV, always had a direct water feed to the tank. Do you see any problems with removing the valve? This is the second valve I've had with this problem. A solution would be to move the valve to the outside. This is a pressure sensitive valve and it doesn't always close quick enough when the water is turned on for the flush and some water vents.
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Old 12-17-2012, 11:41 AM   #2
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Hi Russ

Randy was out 3 weeks ago and worked on my unit. I was having the same trouble and he said they had some bad valves. They have went to a differant kind I think. Contact him and he can fill you in. If I remember right had someting to do with the color of the valve as mine is black.
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Old 12-18-2012, 01:58 AM   #3
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What was the color of the bad valve. I have a black one currently in my 2012 ST25RB which is still the original one. I've noticed the odd drip & small puddleinside bathroom counteronce in awhile.
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Old 12-18-2012, 03:09 AM   #4
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Hey Guys . I have a 2013 25rb with the same problem , black 90 degree part under the sink leaking a bit when flushing tank. Dealer never even inspected it on the original PDI. almost flooded the undersink compartment when I originally tried it. Was warned by others on this forum that CR forgets to tighten the fittings when installing .( maybe they should take a little more time and do everything right )
Tech at dealer said he heard of other techs talking about faulty ones, but denied it when asked???
They are supposed to send me a new one but hasn't come yet.

What colour is the new style??
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Old 12-18-2012, 06:46 AM   #5
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My valve is brass. This is the second one and the first was brass also. The valve is slow to close when the water is turned on but it does close and the leak stops. It would be easy to remove and not have to worry about water on the floor. It's probably a code requirement to have it installed.
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Old 12-19-2012, 09:23 AM   #6
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BLACK WATER FLUSH

Removing these valves from the line could set up a siphon
after you flush the tank. The vacuum breaker / check valve combination is
supposed to keep sewerage from entering the potable water line that is being
used to flush the system.

We moved the Vacuum Breaker and Check Valve to the basement
and mounted then as high as possible. These valves were originally installed in
the living area to keep it high above the black water tank. It works in our
unit as the flush water enters near the bottom of the tank. Unfortunately, if
you read the flush system manufactures installation instructions the flush
nozzle is to be installed near the top of the tank.

We also had a fresh water leak when we used the Black Tank
Flush and this was due to the fact that the clamps used to hold the tubing onto
the fittings were improper. The local hardware store had the clamps need to
repair our unit.

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Old 09-15-2017, 10:28 AM   #7
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I know this is an old thread, but I recently encountered the same problem on my 2016 Sunset Trails. After flushing the tank, my wife noticed water on the bathroom floor. I never knew this valve existed until I opened the base cabinet door and stuck my head inside. There I could see where water had trickled down the hose and onto the floor.

Kamper Dave- you mention the possibility of creating a siphon if this valve was removed. Maybe I need to be educated, but how would a siphon occur as long as air could enter the tank through the vent pipe?
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Old 09-15-2017, 12:12 PM   #8
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Quote:
Originally Posted by oneeyejak View Post
I know this is an old thread, but I recently encountered the same problem on my 2016 Sunset Trails. After flushing the tank, my wife noticed water on the bathroom floor. I never knew this valve existed until I opened the base cabinet door and stuck my head inside. There I could see where water had trickled down the hose and onto the floor.

Kamper Dave- you mention the possibility of creating a siphon if this valve was removed. Maybe I need to be educated, but how would a siphon occur as long as air could enter the tank through the vent pipe?
I'm aware of the good intentions of these valves but after two valve failures and a couple of flooded bathrooms I removed the valve several years ago without any problems. Easy to remove, use the existing fittings to splice the water line back together.
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Old 09-18-2017, 07:28 AM   #9
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I've thought about doing the same thing. Might actually do that before the next outing.
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Old 09-20-2017, 06:58 AM   #10
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They actually manufacture better anti siphon valves. Remember, everything on your rv is low bid.


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