Black/gray tank vents

[Hit The Road]

Help,
I am trying to locate the vent pipes on our 2021 3121 RL. I found a few pipes on the roof but need to be 100% sure. Called the factory to look at a schematic but they weren't of much help. They said there were too many lines in the drawing to accurately pinpoint it.
I am installing a composting toilet and want to vent it thru one of those pipes!

Thank you!
Louie

[rohrmann]

It will be the only vent pipe coming from the black tank.

[DQDick]

If you pull the cap on the vent you suspect the smell will tell you if you are correct.

[Hit The Road]

Originally Posted by DQDick

If you pull the cap on the vent you suspect the smell will tell you if you are correct.

Never used the black tank/toilet. I knew we were changing it out and didn't want to deal with the mess! However I did a detailed tracing and thanks to the 70's, used incense! I took off the under belly and found I few holes in the drop frame that I can run the pipe through! Tapping into the vent pipe would have been complicated so I'm glad I found another way!

[Theunz]

I know very little about composting toilets and I’m not trying to sway anyone’s plans, but I did run across this article and think it’s good reading for anyone contemplating buying one.
https://drivinvibin.com/2020/08/17/r...sting-toilets/