I was thinking about the sacrificial anode in my hot water heater. It screws in via a hole on the top of the unit.
Every time I've made a threaded plumbing connection, I wrap Teflon around the threads before screwing it in.
It occurred to me that Teflon is not conductive. So how does the anode bond to the case of the water heater?
Is it assumed that when tightening the Teflon will deform enough to let some metal touch?
Or does it use a parallel thread and seal on a gasket so as to not use teflon?