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Old 06-27-2022, 05:54 PM   #1
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Any Idea What This Is?

I have two of these on the roof of my 2018 Phaeton. There is a 1/4” gap under these that constantly traps debris. The second picture is with the cover off. As always, thanks for the help!
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Old 06-27-2022, 05:58 PM   #2
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Suspect a vent lid for holding tanks
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Old 06-27-2022, 05:59 PM   #3
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Looks like a previous owner removed his satellite system ; left the roof jack and fitted a dome to hide the mess.

EDIT: can you describe the location on the roof ?
Central location ? Above drivers area? What diameter are they ?
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Old 06-27-2022, 07:15 PM   #4
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There are two of these with one just forward of the rear A/C unit and the other about 4 feet forward of that. I am the original owner so these came from the factory.
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Old 06-27-2022, 07:17 PM   #5
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They are each about 10” in diameter.
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Old 06-27-2022, 07:29 PM   #6
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See any holding tank roof vents up there?
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Old 06-27-2022, 07:36 PM   #7
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If you dig down into those you will find wiring for satellite antennas that your coach does not have installed.
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Old 06-27-2022, 07:45 PM   #8
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1 is prewire for Satellite the other is probably prewire for solar panel
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Old 06-27-2022, 07:55 PM   #9
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Quote:
Originally Posted by RangerIV View Post
1 is prewire for Satellite the other is probably prewire for solar panel
This is the correct answer. One is a pre wire for a Trav’ler satellite antenna and the other is a pre wire for solar. My solar install did not use this, however, as the installer wanted a different gauge wire and shorter run to the batteries.
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Old 06-27-2022, 09:19 PM   #10
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Do you have a ceiling fan in your bedroom? Thats the exterior cover on the roof
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Old 06-28-2022, 05:34 AM   #11
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Pre wire sounds logical

The holding tank vents are over near the side of the coach. These domes just seem a bit excessive. I am going to seal between the flanges and the roof to stop the debris from collecting under them.

I have found, when I hose the debris out from under the flanges, I seem to get water in the rear-most outside storage bays on both sides. Not sure if it is just a coincidence or that is where the other end of the pre wire conduit. Hopefully, sealing around the flanges will stop that. Thank you for all the input!
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Old 06-28-2022, 12:55 PM   #12
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As stated preciously, those are prewired access points. Surprised they leak as Tiffin usually loads them with sealant. It looks like in one picture that some of the sealant is missing . Use self leveling silicone and seal them. The rear one is for a dish satellite, and the front I think may be prewire solar or another satellite. Your original purchase order should have them listed, they used to be an option on most models except the bus but who knows..
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Old 06-28-2022, 04:06 PM   #13
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Quote:
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Do you have a ceiling fan in your bedroom? Thats the exterior cover on the roof
“Ceiling fan”…giggle snort!
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Old 06-28-2022, 04:09 PM   #14
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“Ceiling fan”…giggle snort!


Yeah there is Always one in the Croud...........Its my turn
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