SOG unit for cassete toilets

What is it ? we have a Porta Potti, ???
Cheers Des.

I have a "low cost" version that looks neat, and works very well, it really just comprises:
1. A small computer fan fitted inside the access door.
2. An external vent on the door face.
3. A microswitch and wiring to run the fan when the trapdoor is opened.
I was planning to include some carbon filter foam in the vent but it just hasn't proved necessary. Had also considered making up DIY kits but don't seem to have found the motivation.

We put one on our last van, and were impressed enough to put one on our new van as well. They are expensive, but in my view they add greatly to our comfort in the van.

Thanks for all the info, regards,Mizmu