I'll admit that I have not used a cassette toilet, so I went to the Thetford web site to learn a bit. Right away, I wasn't too impressed with the Thetford video showing a guy dumping a full cassette of sewage into a stainless steel sink at what looks like a fish-cleaning station (a yummy filet of ... what?), or perhaps a hand-washing sink. And then sticking the sink's fresh water hose deeply into the cassette to flush it out. But I know you guys would never do that, right?
Anyway, regarding the pressure build up in the cassette, it would seem to me that a teeny tiny pin hole would be enough to keep the pressures equalized. Choose a location where the contents are below the pin hole both when cassette is in the toilet and when you are toting it. Then heat up a needle, and run it through the plastic. A hole this small would not dribble under any conceivable splash conditions. And if you truly don't like it, it is easy to squeeze a drop of glue into the pinhole to seal it up.
Seems too simple. Have I missed something?
Bill
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