Black /Grey tank vent

[murphytm2001]

We have a 2017 2400WS MBS I noticed only one tank vent on the roof. I assumed that they combined the two tanks into one vent, but after getting random tank odors while traveling is making me think twice. Can someone confirm the number of vents for the same make/ model / year?
thanks in advance!

[gmccullers]

We only have one. I believe it was called the cyclone vent or something similar.

[murphytm2001]

Originally Posted by gmccullers

We only have one. I believe it was called the cyclone vent or something similar.

Thanks for the reply

Tim

[Bama Rambler]

They usually combine the vents. The black tank will be a 'dry stack' and the grey tank(s) will be 'wet stacks'. Then you'll also have air admittance valves at the sinks.

The air admittance valves are likely where the odors are coming from. They tend to stick open sometimes.

[hstroupe]

I put a solar power fan on the exhaust stack. Fixed smell.

[FFred]

Depending on the brand of toilet installed , there will be a hole in the bowl in the rear fairly high up.

This is for overflow prevention , should the fill valve leak the dribble of water is drained there

These are used with a hose behind as an air trap ,bent into a U otherwise it would be a straight shot for black fumes into the coach.

Every so often it is needed to fill the bowl to this drain , but not open the flush.

The shower hand held does a good filling job, before the next tank dump.

Might be worth a test fill?