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Old 08-17-2019, 12:35 PM   #1
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Water leak from under bathroom sink

Hi all. Just noticed some water pooled on our bathroom floor. Traced it to the left side of this brass fitting under the sink. Tightened the plastic hose coming in from the left of the picture with no luck. Keeps dripping.

Going through the Winnebago Plumbing Diagrams now to see what it's called and maybe get to the RV Parts shop before it closes, but thought I'd ask here while looking on the chance someone knows and can save me some time. On a 2000 Winnebago Adventurer 32V. Thanks. Click image for larger version

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Old 08-17-2019, 12:43 PM   #2
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Breaker Vacuum Valve. Now to find one. Attachment 257175Click image for larger version

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Old 08-17-2019, 01:45 PM   #3
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Since the anti-siphon vacuum breaker valve still works, just remove that fitting that is leaking, get a 1/2"x1/2" brass nipple, screw it into the valve. Then, I would replace that 90* fitting. Should cost under $10 and take maybe 20 minutes, total.
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Old 08-17-2019, 01:53 PM   #4
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And you don't need an RV store - any plumbing shop, hardware store or home center should have the parts. All standard plumbing items.
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Old 08-17-2019, 02:03 PM   #5
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Iíve had the same issue on my fiver. But my issue was that the breaker valve froze up... two years in a row. Tried switching to a copper one and now itís leaking
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Old 08-17-2019, 02:37 PM   #6
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Water comes in thru BOTTOM from Black Tank FLush Connection

Water flows out thru SIDE to black tank flush nozzle
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Old 08-17-2019, 03:05 PM   #7
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Our water panel in the wet bay had a leak. Determined it to be a manifold where they joined four lines to the common water source. For some reason the fabricator(s) used plumbers putty on the threads. Over time the putty leaked and the more it leaked the more it would leak. Took the manifold apart and cleaned off the putty and reinstalled the fittings with Teflon plumbing tape. No more leaks and an easy fix. Did have to cut off the Pex compression fittings and replaced them with threaded hose clamps.
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Old 08-17-2019, 03:16 PM   #8
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Two things.


First, if that is the vacuum breaker for the black tank flush, there would only be a leak if a hose is hooked up to the flush inlet and the flushing is in progress. Is that the case in these photos?


Second, in the picture on the left, it appears that water is leaking from the top of the vacuum breaker, and down onto the horizontal port and dripping from under the threads of the fitting. This may be an illusion caused by the camera, but it did look that way to me when I zoomed in.


So, if the leak is from the horizontal threads, easy fix with a new elbow fitting or even plumbers tape. If from the breaker, new breaker or rebuild kits may be available. Regardless, should be no leak unless you are in progress of flushing the black tank. Otherwise, that breaker is for some other device.
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Old 08-17-2019, 08:24 PM   #9
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Quote:
Originally Posted by Ljwt330 View Post
Two things.


First, if that is the vacuum breaker for the black tank flush, there would only be a leak if a hose is hooked up to the flush inlet and the flushing is in progress. Is that the case in these photos?


Second, in the picture on the left, it appears that water is leaking from the top of the vacuum breaker, and down onto the horizontal port and dripping from under the threads of the fitting. This may be an illusion caused by the camera, but it did look that way to me when I zoomed in.


So, if the leak is from the horizontal threads, easy fix with a new elbow fitting or even plumbers tape. If from the breaker, new breaker or rebuild kits may be available. Regardless, should be no leak unless you are in progress of flushing the black tank. Otherwise, that breaker is for some other device.
Agreed. I believe it goes to the toilet as the diagram indicates it has to be above it's flood level.
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Old 08-17-2019, 11:02 PM   #10
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Agreed. I believe it goes to the toilet as the diagram indicates it has to be above it's flood level.

That IS the Black Tank Flush Anti-siphon vacuum breaker that is leaking


IF you look at the rest of that plumbing diagram and follow the line coming out of the side of that Vacuum Breaker it goes to HOLDING TANK


Mounting ABOVE toilet flood level ....
Minimum of 6" required above highest flood level of any fixture connected to waste tank
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Old 08-18-2019, 06:50 AM   #11
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Be careful changing the plastic parts, the outlet side is actually a check valve.

I built a whole new setup but used all brass parts.
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Old 08-18-2019, 06:56 AM   #12
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I agree that it appears to be leaking from the top of the valve. Might be a parts kit available for it as I see screws in the top plate also.
Go on-line to Winnebago Industries and find the parts schematic for it and call Winnebago. Have you vin handy as they will ask for it.
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Old 08-18-2019, 07:15 AM   #13
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Thank you all for the advice again as usual! Turns out that the Y connection that my green tank flush hose was hooked up to had a slow leak causing water to trickle into the Black Tank constantly. We are on a very uneven site for another day so not sure if that contributed in any way to the leak.

Will have to wait until I get home to replace the valve as I just don't have the right tools here with me now.Click image for larger version

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Old 08-18-2019, 10:50 AM   #14
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Originally Posted by joemcgin View Post
Thank you all for the advice again as usual! Turns out that the Y connection that my green tank flush hose was hooked up to had a slow leak causing water to trickle into the Black Tank constantly. We are on a very uneven site for another day so not sure if that contributed in any way to the leak.

Will have to wait until I get home to replace the valve as I just don't have the right tools here with me now.Attachment 257247
OK that would have been useful information knowing that you kept your black tank flush hose connected. This usually results in a disaster when the valve leaks and you come home to an RV flooded with black tank water.
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