Question About Plumbing Vents

Thanks for the link to the video, Paul. That was very helpful!

I called Newmar and the third vent is for the washing machine.

Maybe one of the two that are right next to each other was a mistake that they capped?

I have four...

Assuming you have only ONE gray and ONE black.

The one in the center of the roof is for a Satellite TV Dome or roof mounted dish, It has wires under it, not plumbing.

I just went through this on our 5th Wheel. We had a very small hail storm the roof sewer vents took a hit. We have 5 roof vents but on inspection, only 3 were actual tank vents, the other two were just covering holes in the roof. I think when they build these things they pre-drill the holes for various floor models. So on the two blanks, I got two 2" pvc plugs and capped them off. I then replace all 5 of the roof vents so it looked like it came from the factory.

In replacing, the best tool I found to remove the old dicor was an old flat blade screw driver with a dull end. I tried a plastic 2" and a 2" metal putty knife but they were taking too much dicor at a time. The screw driver worked just right but you must take it easy.

When replacing the old roof vents, I used butyl (sp?) tape on the bottom of the roof vents and then screwed them to the roof, you need #6 one inch screws, six per vent. After screwing them down, use dicor self leveling caulk. This works on all roof types.

Here is a link to this job, they used dicor under the roof vent but my old ones had butyl tape so that is what I used. Sewer vent replacement

The replacement vent I used were these: Sewer roof vent Good service company and fast shipping.

Hope this helps.

If you have any further questions, let me know.

Paul...

No, it has 1 black and 1 gray. It has a washer/dryer. I am just not sure what all those vents are for.

ncrowley wrote:
What are the three vents for?

Could your Newmar have a black holding tank and two grey tanks?

ncrowley wrote:
What are the three vents for?

They are to vent the plumbing.

Go up on roof down close to vents, have DW flush, should be easy to tell. :) Movie RV just came to mind. Be careful up there.

On ours the vents go straight down to the holding tanks.