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Old 10-29-2015, 02:53 PM   #1
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Confused....RV Vent Caps to Nowhere

Here we go....

Crawled on roof to replace factory sewer vent caps with 360 siphon.

3 vent caps in sight.

2 of the vent caps had no pipes and were just covering a hole in the rubber and plywood.

Why? Mistake? Moisture prevention? Some other reason?

On the other side of the fence.....I have 1 black tank and 2 grey tanks. Are they inter-connected to the only vent that had a pipe or is that another mistake?

Thanks for your replies....totally puzzled.
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Old 10-29-2015, 03:50 PM   #2
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Some units have attic vents in the roof

These are separate from your black and grey tank vents but look similar
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Old 10-29-2015, 03:56 PM   #3
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Hmmmmh.....oops!?!

Do I need the attic vents?
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Old 10-29-2015, 04:08 PM   #4
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I had never heard of these before. Based on a little searching, a lot of people haven't. Many confuse them with the plumbing vents.
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Old 10-29-2015, 04:15 PM   #5
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Our rear gray tank has a vent through the side wall.
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Old 10-30-2015, 09:28 AM   #6
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Mine has two vents that appear to be for the roof structure and are not for plumbing, but I haven't looked closely to tell for sure.
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Old 10-30-2015, 09:37 AM   #7
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Conduit to the basement of inside for wiring? I've been on a kick lately that RV manufacturers would do us all a favor if they'd just install one or two with a chase line to aid in aftermarket mods.
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Old 10-30-2015, 12:16 PM   #8
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You only need the 360 on the black tank.
The extra vent caps provide air circulation in the attic space much like the attic venting in a house.
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Old 10-30-2015, 07:38 PM   #9
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Texas, I have the same configuration, 1 black and 2 grey tanks. I bought the 360 siphon and thought I needed 3 since that's how many vents are on the roof! I haven't installed them yet, but can you tell if there is a pipe before taking off the sealant?
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Old 10-30-2015, 09:04 PM   #10
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Quote:
Originally Posted by atcla View Post
Texas, I have the same configuration, 1 black and 2 grey tanks. I bought the 360 siphon and thought I needed 3 since that's how many vents are on the roof! I haven't installed them yet, but can you tell if there is a pipe before taking off the sealant?

Yes, remove one screw in cap, above roof. You'll see pipe or not straight away. Fakes can also hide wires for not purchased add ins. Very common to have two or three vents to combine to one termination.
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