[Dave W]

The only sensors I've found that work more then a few days are the Garnet SeeLevel's. If you NEED to know the level of the black tank. They are a PITA to install, but work. I installed them on the last 5er but with the galley and fresh tanks so difficult to access, decided that I would try these - Horst (now Valterra) Miracle Probe Sensors since I had to pull the front belly cover for a minor leak. Oh well, better then the originals but not by more then a few weeks. I back flush the tank about every other dump and then they work for a few more days.