[MarkoPolo]

The cassette is factory installed, removed from the outside by unlocking and opening a door. I have photos of it at home that I will try to post some tonight. I don't have the exact numbers, but it does not hold as much fluid as the recirculating toilet, but it is so easy to empty that's not a big issue. BTW I did empty it once at the RV dump. Just step on the foot control and pour it in.