I_am...HelloSailor has is almost spot on. The Canadian Edel's from what I can tell used Potpourri portapotties made by Sanitation Equipment Limited. Most of them where Model 707's that have been MD'd. They were installed much like an MSD portable in that it has pump out capabilities (on your boats port side) along with a tank vent (also on your port side). The Potpourri toilet does not have separate chambers for clean water and waste water - it all goes in one big chamber. You must add your water and chemicals and that is what is pumped into the bowl. Hello is also right about the rubber parts.... you may want to give them a call or email. I never did and would be interested in what they tell you about spares (as I recall you can find instructions on the unit on their web site).
Portable potties, Sanitation Equipment Limited Home