I added a vent to our stinkford using about 20 dollars in materials from the plumbing section at Home Depot. The difference it made is unbelievable. We camped in Myrtle Beach in August, and had no awful smell. (Last year in West Virginia, in June, we were "smelled out".) I changed all seals and thoroughly cleaned the toilet before re-install which I'm sure also helped. Either way, I highly recommend trying before you spend another $400. I think I wrote how to do the vent on another post, but would be happy to repost if you are interested. Keep in mind, I am a woman, and do the mods to our TM myself...it's not difficult.
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