Heater core line at engine side leaking

3.1 engine. Where the rubber hose ends and connects to metal tube which then goes into engine more or less right behind the therm housing (or the engine part of what the therm housing connects to) is leaking. Im just not sure if that metal tube can be pulled out. Seems to be held on with a gasket of some sort. Must come off because its leaking around the seam or where it connects. It looks like its just pushed in. I cant seem to find info on what those metal tubes or their (gaskets?) Are called so im worried about taking it off. Please help.I attached photo with arrow pointing to hose at the 3 oclock position of thermostat. Thank you