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Hi jean, I happened to stumble on your OLD post about using pipe dope instead of teflon tape on a probe style LWCO, that teflon tape could inhibit conductivity but pipe dope squeezes out. I mean no disrespect I just wanted to clarify something. The probe is connected to the circuit board of the LWCO and isolated from the pipe by a ceramic isolator. This is done intentionally so that the probe doesn't touch the shell or pipe of the boiler ( giving a false water level signal if it wasn't isolated) in order to only have conductivity if water IS present. There fore the method of "sealing the probes threads to the system is irrelevant. Again this discussion is quite old and perhaps you already know this I just though I'd message you as that old post is still viewable to others. Regards, Robert (Bob) Hope Conti Mechanical Local 636 Detroit