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Old 09-15-2019, 05:48 PM   #21
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2021 30' Globetrotter
East Northport , New York
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Quote:
Originally Posted by AirMiles View Post
Was there a gap between that black rubber ring and the black pipe? It looks like there is a gap in your picture. If that rubber ring isn't sealed tightly against the pipe, that is how the water is getting into the Airstream.
Yes, there was a gap. There was a ring of sealant there that I removed. It was loose and wasn't doing much. No water should be in there in the first place if the vent was installed properly.

Quote:
Originally Posted by jeffmc306 View Post
James, thanks for the photo and what you found. If I understand correctly, the cone should be glued to the bottom of the cap? If so, couldnít you just use the one you had? Sorry for the questions but Iím trying to visualize how it should be assembled.
Yes, cone should be glued to bottom of cap. I could have definitely reused the old vent. I ordered the new one in case I broke the one I was removing and figured I'd just use the new one since I had it.
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Old 09-15-2019, 06:42 PM   #22
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Quote:
Originally Posted by Biker View Post
Yes, there was a gap. There was a ring of sealant there that I removed. It was loose and wasn't doing much. No water should be in there in the first place if the vent was installed properly.



Yes, cone should be glued to bottom of cap. I could have definitely reused the old vent. I ordered the new one in case I broke the one I was removing and figured I'd just use the new one since I had it.
Thanks James, thatís exactly what I needed to know before I take mine apart.
I think you just solved a big problem for all of us! I love the forums
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Old 09-16-2019, 07:31 PM   #23
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Found the same issue as James - funnel not glued to cap

Thanks to the tip from James, I removed the stack vent cap and found exactly what he did - the funnel was resting on the top of the stack pipe, not glued to the cap on both grey and black tanks.

The 360 Siphon design is really simple and, if the funnel is secured to the cap, the rain water will go down the stack pipe into the tank. Left loose, water can leak under the funnel and down the stack pipe into the trailer. Thatís what happened to us during the heavy rain two nights in a row.

It took roughly 15 minutes to remove the cap, clean up the caulk, glue the funnel to the cap and reinstall / re-caulk. If youíve got a few minutes, I highly recommend inspecting yours!

PS: The black tank stack did not have sealer between the stack pipe and the gasket. The grey tank stack did have a bead of sealer around the pipe and when I pulled the cap off, water ran out (would have gone inside the trailer without the sealer).
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Old 09-16-2019, 07:47 PM   #24
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This is what the grey tank stack pipe looked like - sealer applied around the pipe. You can see the water that leaked out when I pulled the cap.

The photo on the right is the black tank stack. The dark area on the gasket is still wet - gap near the pipe and gasket is where it leaked inside the trailer and eventually onto the toilet seat. Lucky for me it was easy to find. When the funnel is glued in the water goes right down the stack pipe.
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Old 09-17-2019, 05:57 AM   #25
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Thanks for the detailed pictures and descriptions Jeffmc306. I like the looks of the second vent with the white SikaFlex 221 sealed around the pipe. I've heard that these black pipes are not stationary, they move when hitting bumps on the road. Will the SikaFlex stay sealed over time? Will the cone stay glued to the top? For these reasons, I'd rather have the old style vent cap with the overlap on the outside. https://www.amazon.com/Ventline-V204...D6GXBTVPR73CD7
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Old 09-17-2019, 09:26 AM   #26
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Quote:
Originally Posted by turk123 View Post
Climb up near the bathroom vent and remove the two screws and have a look inside. The two screws should have a rubber washer on them. Check to see that the vent is actually closing right and the foam gasket is sealing.

If it is the gasket, go to home depot and get some window seal.

The water could be coming from the vent and moving over to the seam. Check all the white goo around the vent pipe and the bathroom fan.

I do not see sealer around the bathroom fan in your picture!


A sealant that will never leak or deteriorate from UV is 3M5200
(Non removable) or 3M5100 (removable).
Itís widely used in the boating industry for boat assembly as well
as sealing any under water through hull fittings. There is nothing on the market that is comparable.
HD used to carry it but discontinued it a few years back. It was too expensive...but itís worth the added cost because itíll never need replacing.
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Old 10-22-2019, 12:01 PM   #27
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Quote:
Originally Posted by jeffmc306 View Post
When the funnel is glued in the water goes right down the stack pipe.
What glue do you guys recommend when attaching the funnel ?
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Old 10-23-2019, 07:02 AM   #28
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Originally Posted by Xplore View Post
What glue do you guys recommend when attaching the funnel ?
I used Gorilla Glue because my PVC glue was dried up. The funnel fit tight so the glue is more insurance.

No leaks since!
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Old 03-05-2020, 01:37 PM   #29
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We had the same issue in our 2019 27fb Globetrotter - leak in seam above toilet. I suspected the 360 Siphon vent stack cap. To prove the concept I screwed a plastic bowl upside down to the top of the cap and the problem disappeared. Moving to a Rubbermaid bowl for production fix until we can get a permanent part. Just need to stop the sideways rain or rain when moving so something that hangs below the side openings should work.
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Old 03-06-2020, 05:59 AM   #30
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Quote:
Originally Posted by LSGAirstream View Post
We had the same issue in our 2019 27fb Globetrotter - leak in seam above toilet. I suspected the 360 Siphon vent stack cap. To prove the concept I screwed a plastic bowl upside down to the top of the cap and the problem disappeared. Moving to a Rubbermaid bowl for production fix until we can get a permanent part. Just need to stop the sideways rain or rain when moving so something that hangs below the side openings should work.
LSGAirstream, that's a good way to proof the problem.

All you need to do is glue the funnel to the top and there's no way for sideways rain to get in. Just scape off the silicone from the 360 vent and remove the screws.

Reseal after gluing the funnel. For some reason they just drop the funnel in the stack at the factory.

Good luck!
Jeff
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Old 04-13-2020, 12:52 PM   #31
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Quote:
Originally Posted by AirMiles View Post
I had the same leak of my 2017 FC25FB. I resealed the fan vents and sewer vents and that did not fix the leak. I glued on 4" PVC sewer caps on my black and grey tank vents and the leaks went away https://www.homedepot.com/p/4-in-PVC...7HD4/205799563 . I vote that its the black and grey vents that are leaking when it rains hard at an angle. By adding the PVC cap over the stock vent, it turns the stock Airstream vents it into one of these: https://www.amazon.com/Ventline-V204...WF7NAADD2QFQ24

This problem has been occurring on many new Airstreams. Maybe I should just glue on some 4" PVC vent caps on my new Globetrotter before it leaks as preventative maintenance.

Here are pictures of my FC25FB with the 4Ē PVC caps installed.


Thanks for this post. After an unsuccessful trip to dealer to fix leak, I found it still leaked a week or so later on the road. I tried your fix with the pvc cap and two months later and several heavy rains, no leak. Seems as though the service people would know about this problem.
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