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Old 11-28-2022, 12:57 PM   #1
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Black Tank Vaccum Breaker Valve

Good day all. Hope everyone had a great Thanksgiving. Question on the vacuum breaker valve for the black tank flush. What makes them leak? Daughter and son in law are on valve #3. Installed it Friday and it leaks already. They either have to turn off water to rv or keep towels under it. If they are not flushing why is it getting water? Should only be during flushing, correct?
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Old 11-28-2022, 01:48 PM   #2
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The black tank cleanout is a self-contained plumbing system not tied to any other plumbing. It could be that the water lines need washers (maybe like this). Don't know why it would leak if not connected specifically to the input port.
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Old 11-28-2022, 01:50 PM   #3
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Their valve does look like one of these, correct?
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Old 11-28-2022, 01:53 PM   #4
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This is how the system is typically installed. Completely separate system.
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Old 11-28-2022, 01:57 PM   #5
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Originally Posted by ard58 View Post
Good day all. Hope everyone had a great Thanksgiving. Question on the vacuum breaker valve for the black tank flush. What makes them leak? Daughter and son in law are on valve #3. Installed it Friday and it leaks already. They either have to turn off water to rv or keep towels under it. If they are not flushing why is it getting water? Should only be during flushing, correct?
As Bubbles mentioned, the black tank flush port, lines and the anti-siphon/check valve is a plumbing system separate of anything else in the R/V. If they have nothing connected to the black tank flush port, then no water should be leaking from it. You only connect a supply hose to the black tank flush port when you want to flush the black tank. It should not be connected/supplied with water any other time.

If water is coming out the valve with nothing connected to the port then something is plumbed incorrectly but even so if there is a water supply somehow tied into the flush line it should simply be flushing/filling the black tank and not leaking water out the valve.

What make/model R/V do they have?
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Old 11-28-2022, 02:49 PM   #6
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Thanks all.
Yes bubbles, it looks like the black one. And by the plumbing print, there should be no other water source to it. So I guess my next step would be double check that it is plumbed correctly.
5Picker, it is a FR Coachman Catalina.
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Old 11-28-2022, 03:04 PM   #7
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Not familiar with the Catalina so have to ask. Are there separate ports for the black tank cleanout and city water? Is a selective valve involved? And if separate is the city water port the one connected to?
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Old 11-28-2022, 03:39 PM   #8
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Thanks all.

Yes bubbles, it looks like the black one. And by the plumbing print, there should be no other water source to it. So I guess my next step would be double check that it is plumbed correctly.

5Picker, it is a FR Coachman Catalina.
Which Catalina model number?
Your profile says you have an 2017 Outback 325BHS.
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Old 11-28-2022, 03:58 PM   #9
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Which Catalina model number?
Your profile says you have an 2017 Outback 325BHS.
I believe it is their daughter/SIL's R/V. (post #1)

I'm with bubbles/bikendan... give us a specific model so we can look to see if it has a separate black tank flush port or if by some chance you turn a valve to divert city water to the black tank. (would be odd but hey...)

We need additional information.
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Old 11-28-2022, 04:13 PM   #10
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Yes, mine is the Outback. This is SIL and daughters. It's a 303RKDS Coachman Legacy.
Yes, it has separate connections for city water and black tank flush. I spoke with a local rv repair and they think if the valve is dripping without the black flush being used, then it must be siphoning the water up out of the black tank. They suggest to either bypass the valve, or, the sprayer must be plugged and need cleaning. That is a project they said. I think since it's not in a park, we will bypass the valve and put a shutoff on the end of the hose that we use to flush the black tank. This is due to them living in it full time, they are in process of building a house on land we gave them. As always, thank you all very much for the advice, pictures, etc. If I dont post again, Merry Christmas and Happy New Year to ALL!
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Old 11-28-2022, 05:13 PM   #11
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Yes, mine is the Outback. This is SIL and daughters. It's a 303RKDS Coachman Legacy.
Yes, it has separate connections for city water and black tank flush. I spoke with a local rv repair and they think if the valve is dripping without the black flush being used, then it must be siphoning the water up out of the black tank. They suggest to either bypass the valve, or, the sprayer must be plugged and need cleaning. That is a project they said. I think since it's not in a park, we will bypass the valve and put a shutoff on the end of the hose that we use to flush the black tank. This is due to them living in it full time, they are in process of building a house on land we gave them. As always, thank you all very much for the advice, pictures, etc. If I dont post again, Merry Christmas and Happy New Year to ALL!
Something is definitely wrong here. The valve has a spring-loaded ball check valve on the output and cannot siphon. If the cleanout is used the residual water in the valve cavity will run back out the input port when disconnected but this is a small amount. It's still not clear how water is getting to the valve when the clean out port is not connected. Happy trails.
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Old 11-28-2022, 09:07 PM   #12
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Something is definitely wrong here. The valve has a spring-loaded ball check valve on the output and cannot siphon. If the cleanout is used the residual water in the valve cavity will run back out the input port when disconnected but this is a small amount. It's still not clear how water is getting to the valve when the clean out port is not connected. Happy trails.
Agreed, no way the black tank flush is siphoning out of the tank onto the floor and if it was somehow, it would be black water. I'm sure whatever was collected in the towels they said they put down, would be nasty.
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Old 11-29-2022, 03:19 PM   #13
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Uhh...

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Agreed, no way the black tank flush is siphoning out of the tank onto the floor and if it was somehow, it would be black water. I'm sure whatever was collected in the towels they said they put down, would be nasty.
I'm confused (again). If the black tank flush system is siphoning out, it would be emitting water out the female hose connection (FGH) on the outside of the trailer.

Where do the towels on the floor come in?

Could it be bad caulking around the external flush connection, with rain water intrusion?

Or something else is leaking. It would help to know if this is a continuous or periodic leak.
Periodic leaks would be things like the shower hose/head, showermiser, kitchen spray head hose, other lines beyond faucets, or rain water intrusion.
Continuous leaks include the rest of the plumbing.
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Old 11-29-2022, 04:07 PM   #14
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I'm confused (again). If the black tank flush system is siphoning out, it would be emitting water out the female hose connection (FGH) on the outside of the trailer.

Where do the towels on the floor come in?

Could it be bad caulking around the external flush connection, with rain water intrusion?

Or something else is leaking. It would help to know if this is a continuous or periodic leak.
Periodic leaks would be things like the shower hose/head, showermiser, kitchen spray head hose, other lines beyond faucets, or rain water intrusion.
Continuous leaks include the rest of the plumbing.
Larry, if you go back and read post #1 they say the anti-siphon valve leaks (actually three of them now) and they have had to to keep towels under it or turn off the waster supply to the R/V. Their dealer tried to make them believe the liquid was siphoning out of the black tank.
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Old 11-29-2022, 04:13 PM   #15
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Thanks...

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Larry, if you go back and read post #1 they say the anti-siphon valve leaks (actually three of them now) and they have had to to keep towels under it or turn off the waster supply to the R/V. Their dealer tried to make them believe the liquid was siphoning out of the black tank.
Thanks for the clarification.

Was it leaking at one of the two connections, or out of the air vent?

If it is one of the connections, and wasn't fixed with a new valve, the mating part may be cracked, scratched, or deformed.

I don't have a good idea how water could get that high, but would be interested to learn whether there's still a leak (out the vent? highest point?) after the connection is fixed.
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Old 11-29-2022, 09:07 PM   #16
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Are you on well water supply or rural water supply?
Are you using a water filter?
Are you using a pressure regulator?

I use a water filter mainly to keep out contaminants out of water system sand small dirt or anything else. I hooked up at a camp site was flushing hose and I felt fine sand not much, but it could affect vacuum valve on flush if I would have flushed black tank. Campground was on rural water. That's why I ask about water supply. Anyway, I went into Wally world and purchased an inline water filter. I always use a filter after that.
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Old 12-05-2022, 08:21 PM   #17
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Replaced mine after a year

I have a 2019 Rockwood ultra lite . Mine started leaking and I bought a new one on Amazon. It was covered under warranty but it was easy to replace. I have had no problems with the replacement. Might be a bad replacement you got.
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Old 12-05-2022, 08:48 PM   #18
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Originally Posted by ard58 View Post
Good day all. Hope everyone had a great Thanksgiving. Question on the vacuum breaker valve for the black tank flush. What makes them leak? Daughter and son in law are on valve #3. Installed it Friday and it leaks already. They either have to turn off water to rv or keep towels under it. If they are not flushing why is it getting water? Should only be during flushing, correct?
These are notorious for failure and cheaply made at best. Mine leaked so I just removed it from the system, plumbed it straight through, and use an anti-siphon valve on the end of my black flush hose. Performs the same purpose and never have to worry about water leaks inside the trailer again. Other benefit was better pressure into the tank.
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Old 12-06-2022, 08:46 AM   #19
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These are notorious for failure and cheaply made at best. Mine leaked so I just removed it from the system, plumbed it straight through, and use an anti-siphon valve on the end of my black flush hose. Performs the same purpose and never have to worry about water leaks inside the trailer again. Other benefit was better pressure into the tank.
I've had 2 leak on my 2021 Vibe, so this time I replaced it with a brass backflow preventer (see below) and a brass 90 degree to get the connections more like the original black plastic one.
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https://www.amazon.com/dp/B098FNPTCV...roduct_details
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