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Old 07-21-2017, 01:11 PM   #1
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Roof vent identification

I'm wondering if anyone can help me identify the three piped vents from front to back on the drivers side of my 2001 CC Magna. The one closest to front has a gap of around 6 inches from the other two that are within a couple inches from each other. I'm thinking
1 - fresh (sinks and washer/dryer)
2 - gray water tank and
3 - black water tank

I am experiencing a very slight odor when opening the door after stopping to fill up on fuel, after driving awhile, from what i'm assuming is the black tank and want to check the vent to assure its clear. Thinking of replacing these vent caps with "360 siphon" covers. Any suggestions?
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Old 07-21-2017, 04:15 PM   #2
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I'm sorry I can't answer our question about which vent is which.

But I'd also suggest you look for air gaps, and see if they need replacement.

Here is a picture of one, probably not the same as is in your coach, but to see the basics shape and design.

STUDOR 1-1/2 in. or 2 in. PVC Mini Vent Adapter-20341 - The Home Depot

Look under your kitchen or lavatory cabinets for these. Usually up aways, and towards the back. Our coach has three that I know of, and suspect a 4th behind the Splendide too.

As these start to fail, odors can work into the coach.

Hope someone else can answer your other question. While not a perfect solution, perhaps if you have water in both grey and black, go up on the roof by the vents, and then have an assistant open the grey and listen, you might be able to hear which vent is for grey, and then repeat for black.

Best of luck to you,
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Old 07-21-2017, 04:27 PM   #3
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Quote:
Originally Posted by JRadtheNoMad View Post
I'm wondering if anyone can help me identify the three piped vents from front to back on the drivers side of my 2001 CC Magna. The one closest to front has a gap of around 6 inches from the other two that are within a couple inches from each other. I'm thinking
1 - fresh (sinks and washer/dryer)
No such thing, sinks and washer use a P-trap and/or 'cheater vents,' not rooftop vents like a house.
2 - gray water tank and
3 - black water tank

I am experiencing a very slight odor when opening the door after stopping to fill up on fuel, after driving awhile, from what i'm assuming is the black tank and want to check the vent to assure its clear. Thinking of replacing these vent caps with "360 siphon" covers. Any suggestions?
Cheater vents do go bad and cause sewer odors in the RV. Also, be sure not to leave a window or roof hatch open while driving, this can cause negative pressure in the RV and draw odors in the cheater vents or even the toilet if the bowl doesn't have water in it to ensure it's sealed from the black tank. If you infrequently use the washer, pour some water down the drain pipe to make sure the P-trap has water in it.

If you remove the cover from one of the vents and pour in some food coloring, you'll know which tank it vents when dumping the tanks -- if you use a clear section of drain pipe when hooking up your stinky slinky.
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Old 07-21-2017, 06:54 PM   #4
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On my 2000 Magna the vents are
1. Gray
2. Gray
3. Black

Number one is for the washer/dryer but originates at the gray tank with the washer/dryer connected on the way to the roof.
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Old 07-22-2017, 10:18 AM   #5
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My vents are shown on the plumbing diagram in the manual. Hope you have the manuals.
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Old 07-23-2017, 09:31 PM   #6
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Use your nose and you can distinguish the gray from the black pretty easily.

Rich 2002 Magna
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Old 07-24-2017, 09:49 AM   #7
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Use your nose and you can distinguish the gray from the black pretty easily.

Rich 2002 Magna

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