Dometic Sealand Toilet will not shut off -- Overflow

We replaced our original toilet with an all ceramic Sealand Concerto.

While we were at it, behind the toilet we installed a ball valve in the water supply and a cut off switch in the 12 volt supply.

Fortunately we've never had to use either one, but they are ready in case of need.

If you're making repairs, you might want to consider putting in an emergency shut off. It will allow you to use the rest of your RV water system while waiting for parts, etc.