Jabsco
When I bought my system, I was considering the Raritan PH II as Peggy as recommended, but others have suggested the Jabsco is much cheaper (often on sale for $99), has half the parts (KISS) and if and when it fails in 4 or 5 years,just buy a new one. The Raritan will also require maint. in a few years and the service kit is close to $50 bucks. Who wants to rebuild a toilet when for $50 more, you can just get a new one. If you are cruising in some remote area, ok , get the Raritan and a repair kit, but if you're staying here in the US why not go the disposable route.