Horst Miracle Probes for Waste-water Tanks in Recreational Vehicles RVs – The Horst Miracle Probe replaces the existing sensors in the black and gray tanks. The probes fit the same 3/8″ diameter holes and use identical grommets to make a seal. The probes work with the existing monitor and wiring harness making it simple to implement the upgrade. Once installed, the customer experiences a dramatic improvement in accuracy and reliability for the tank monitor.
I’m temped as my sensors are never accurate, except the fresh water.