[CONMAN]

Thinking of adding expansion tank. I know this has been discussed before but I don't quite understand. Intake has thermostat housing with bypass included.
When I install the expansion tank, it will not include bypass hose fitting. I have never had thermostat housing off. Is the hole in the intake threaded for an adapter to attach hose? If not, what does everyone do in this situation?
Pictures or diagrams would be helpful !!

Thanks > jim