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10-29-2015, 01:53 PM
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#1
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Member
Join Date: Jul 2015
Posts: 34
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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.
__________________
Chevy 3500HD Dually
XLR Thunderbolt 417amp
RZR XP 4 1000
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10-29-2015, 02:50 PM
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#2
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Senior Member
Join Date: Oct 2013
Posts: 1,460
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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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10-29-2015, 02:56 PM
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#3
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Member
Join Date: Jul 2015
Posts: 34
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Hmmmmh.....oops!?!
Do I need the attic vents?
__________________
Chevy 3500HD Dually
XLR Thunderbolt 417amp
RZR XP 4 1000
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10-29-2015, 03:08 PM
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#4
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Site Team
Join Date: Sep 2014
Location: Northen IL
Posts: 8,326
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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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10-29-2015, 03:15 PM
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#5
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Boss Ox & Drovergirl
Join Date: Feb 2014
Location: N.E. Ohio Snow Belt
Posts: 1,341
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Our rear gray tank has a vent through the side wall.
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Mark, Vicki, & Scout THE dog
2015 Hemisphere 282RK
2016 GMC 3500HD Duramax dually
1992 Goldwing Aspencade
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10-30-2015, 08:28 AM
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#6
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Senior Member
Join Date: May 2015
Posts: 1,397
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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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10-30-2015, 08:37 AM
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#7
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Always Learning
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,891
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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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10-30-2015, 11:16 AM
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#8
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Senior Member
Join Date: May 2013
Location: La Mirada, CA
Posts: 528
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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.
__________________
Gary and Donna
2005 Cardinal 33TS-LX
Trail Air pin box
Center Point suspension
2018 Ram Laramie 3500 6'4" box 2WD
Demco AutoSlide 18k
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10-30-2015, 06:38 PM
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#9
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Senior Member
Join Date: Jul 2014
Location: West Coast
Posts: 109
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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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10-30-2015, 08:04 PM
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#10
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Senior Member
Join Date: Dec 2011
Posts: 3,570
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Quote:
Originally Posted by atcla
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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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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10-30-2015, 11:19 PM
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#11
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Senior Member
Join Date: Jul 2014
Location: West Coast
Posts: 109
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Thanks Vince! I didn't want to waste time and material on vents I don't need to replace!
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10-31-2015, 06:11 PM
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#12
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New to FR. Old to TT
Join Date: Sep 2015
Location: SW MI.
Posts: 235
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We have 3 vents on our TT and I have replaced them with 360 siphon and all had vent pipes. Most TT have vacuum pressed roofs and as such don't need a attic vent, one way you may not have a pipe at the roof is if your vent pipe has fallen in to the tank. You might look down the hole with a flashlight and see if you see the end of the pipe. Gray tanks will also benifit from the new cover. Good luck.
__________________
2018 GMC 2500 Denali HD ,Duramax with Allison trans.
2019 Cedar Creek 36ck2
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10-31-2015, 08:38 PM
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#13
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Oklahoma Proud
Join Date: Jul 2012
Location: central OK
Posts: 2,784
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Op.
I have 5 tanks on my sabre and i have 3 plumbing vents on my roof, 2 attic vents, and a rear tank vent out my rear wall for my outside kitchen.
My roof plumbing vents have a screw that holds the caps on. The attic vent caps just spin on with a bold made into the bottom of the cap. They just have insulation visable after spinning the cap off. (Sorry i dont have pics)
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