Black tank vent

[PC Red]

We have a Micro Minnie 1808 and on the rear roof there are two black vents. One is at the middle rear of the roof and the other is to the left of the bathroom exhaust fan. I’m assuming that one is the black tank vent?? If so, what’s the other vent? Is there one for the gray water tank? I’m asking because I want to replace the black tank vent with one of those 360 Siphon vent caps.
Thanks
PC

 

[Seon]

Should be fthe Gray tank vent.

 

[PC Red]

Sean
So the vent in the rear center is the gray?

 

[Seon]

Your unit has two tanks, Black and Gray. Each tank has a vent. Which is which will be up to you to determine based on location of the tanks. If your black tank is forward of the Gray, then the vent will be the most forward of the two vent.