If anyone knows about cathodic protection it's a Navy man. The only place I've seen it used is to protect the water heater of one manufacturer and they use a replaceable sacrificial anode screwed into the tank. The other popular manufacturer does not, I think they use a stainless steel tank but I'm not sure. I also don't remember which company uses the anode. Hope that helps some.
2007 Newmar DSDP 4023
Discovery is seeing what everyone else has seen and thinking what no one else has thought.
If you want to see what man made go East; if you want to see what God made go West.