toilet vent on roof

[chevelle69]

Any one know how to tell which vent on roof is for the toilet on a 2015 3970RD? I have 3 vent caps that come from bathroom. One looks to come up from behind sink and other two come up from behind toilet and are right next to each other on the roof!

[kdeiss]

I would go up on the roof and have someone flush and listen or give it a sniff !

[jimcol]

The sniff test won't lie to you on this one!

[chevelle69]

Ugh... I was trying to avoid sniff test! Lol

[jcurtis934]

The sniff test is a lot more user friendly than babies...and hard to mis-identify the tank. Just don't try the taste test. John

[Artemus Gordon]

The sniff test and taste tests are last resort's!

[WeBeFulltime]

The taste test would not work for me. I don't know what taste to compare it to!

[andylparish]

Sometimes the sniff test will cause a taste test, LOL.

[DonPd]

Once you locate the correct vent and I assume you want to replace it. I replaced mine with one of these. I do think it made a difference and it has no moving parts.

https://360productsnorthamerica.com/site/