Originally Posted by bjsheldon
The "Cyclone" tank vent available at Camping World for $20 will also do the job. I had the same problem, added the Cyclone and walla, no stink.
Indeed that is what I was referring to, and yes "Voila" the stink went away. I also note that Daveshan was much more helpful buy posting a picture of the thingy I was talking about. That is the part that can get knocked off.
What I find odd is that I posted AFTER Daveshan but didn't see that picture.