I do not know about the Concerto toilet,but replacing virtually every thing in our SeaLand 510 was an easy deal, and my thought was it is the moving parts that make the toilet everything else is ceramic. We are good to go for another ten years at least I am sure. I pulled it completely to allow a cleaning of the toilet and surrounding area, Good as new.
I do all my own stunts
03 Dolphin LX 6355, Workhorse W22, 8.1 vortec, 04 CR-V, Blue Ox, Brake Pro----Norm, Barb and
Doc(He's a PhD)