It hasn't been made in over 20 years...
And for a very good reason, too...recirculating systems are a nightmare...they stink! 'Cuz "recirculating" means exactly what the word implies...waste and chemicals in the holding tank are recirculated as "flush water" through the toilet. There were several on the market in the '60s and '70s--the Monogram Monomatic, one made by Thetford..even one made by Danforth (yep, same company that makes anchors)...they were all discontinued by the early '80s. Some were self-contained like a portapotty, and had electric pumps to recirculate the waste through the bowl...yours used a regular manual toilet and a separate holding tank...with check valves and antisiphon devices inline to prevent seepage and backflow. You can prob'ly get it working again if you call Jabsco (Par is a Jabsco brand name) for information...but I wouldn't. I'd buy a new toilet (after 30 years, it's definitely worn out) and plumb it to flush with sea water--which may mean installing a thru-hull and seacock--and connect only the head discharge to the tank. A threaded plug will seal the unused inlet fitting in the tank.
