I am rather enjoying the technicality of this thread...have not got a clue as to what is really going on...My Cabin A (Aliner TT)lost sewer lines on the way to Maine a couple of years ago. Bottom line was that they could not find a black water tank as these were special made for the Cabin A and even Aliner did not have any in stock...so we straight piped it.
My solution since nothing solid goes into my toilet (never has) unless an emergency, is now I use a leaf and lawn bag and only use the camper potty at night.. This bag is treated similar to a cassette and dumped and thrown away daily.
My toilet down right stinks in the TM. The previous owner made a vent next to the sink. I run the fan. I used the chemical with formaldehyde (which I am deathly allergic to, turned the bathroom fan on and could not breathe that night and my face looked burned, luckily I was home opened all the windows the next day, turned on the ceiling vent fan in the main part of the camper Jon put in and added another fan), still it stinks, it has enough water.
We do not have a sewer clean out in the yard, or I would flush and flush and flush and dump. I need to take this to a campground with sewer hookups to do this.
Jon, volvofan also said if you pulled the little handle before opening the outside valve, sewage flowed through onto the floor...he thinks it may need a new seal. Goodie, with RV tech rated at $125/ hr and me being not technically inclined and my husband just not able to do things like this...in fact I had to figure how to get the spare tire cover off...he could not... At MCDill last year there was a man with a truck who charged $65 per hour to come on site...may have to just wait til we get down there this winter if it leaks into the bathroom when trying to empty.
Bottom line fellows, keep up the good work, even if you loose me, there are others who can follow along.