Black Tank Vent

Black tank odor. A well designed system shouldn’t smell. And ours doesn’t……99.9% of the time. Once in a while when it’s windy, or when driving I suspect a down draft happens into the vent and puts pressure on the tank…. (I verified that the vent is in fact working so that’s not the problem) and said pressure burps out somewhere. And it disappears rather quickly. So, it’s a hard problem to fix. So I came upon a vent that claims to always maintain suction on the system. Up on the roof I went. Two vents….hmmmm. Call below and had someone flush…. sound gave it away, the rear one. (Makes sense as the black tank is the rear one of the two.)

Proceeded to remove the Dicor sealant. Note the screws torqued down so as to crack the fixture in several places. Sigh.


Then the vent cap. Pipe was a little askew, and that’s after they drilled the SECOND hole…. oh well.


Glued the vent on to the pipe….


And re-sealed…..


We shall see. I will report back here.

As an aside, the sealant coming off was still nice and flexible. And, while I had the gun out I checked all the other sealant on the roof…. But it was all in good shape.

So after 1000 miles all concerned agree….. this works and we have not had any whiffs…..