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Old 07-22-2019, 11:55 PM   #1
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Three vents on top that looks alike

On a Thor class c thereís three vents on top that looks identical, wich one is that black tank so I can install a 360 vent?
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Old 07-23-2019, 12:36 AM   #2
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Which Class C: There are multiple years/models.
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Old 07-23-2019, 10:58 AM   #3
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You might want to download the Schematics for your rig from the Thor Owner Resource site.

It will have a plumbing schematic. My class C only shows two vents and I have only noticed two when up on my roof; one for the lank and one for the gray tank.

From the schematics you can get an idea if which vent is which.
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Old 07-23-2019, 12:09 PM   #4
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If you put your nose to the vents: it will quickly become apparent...
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Old 07-24-2019, 06:12 PM   #5
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Good Old Bob always has the answers. LOL.

If the "Bob stink test" dont work mabye someone can be on the roof and listen for air being sucked into the correct air vent as you dump the black tank?

Im sure it would have to have a sucking sound if your close enough to it.

Just an Idea.
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Old 07-25-2019, 05:56 PM   #6
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Quote:
Originally Posted by Long & Winding road View Post
Good Old Bob always has the answers. LOL.

If the "Bob stink test" dont work mabye someone can be on the roof and listen for air being sucked into the correct air vent as you dump the black tank?

Im sure it would have to have a sucking sound if your close enough to it.

Just an Idea.
good idea...another variation might be to have someone run some water into it while listening

on mine it's obvious....toilet is on driver's side and all the grey water stuff is on the other side. Up on the roof i have one vent each side....
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Old 07-25-2019, 06:55 PM   #7
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Originally Posted by Long & Winding road View Post
Good Old Bob always has the answers. LOL.
... And if I don't have the answer: I'll make something up!
Seriously: this one would work. Just don't let it ruin your appetite!
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