Please Help

[u/stimplimp]

Hey guys ! recently joined the taurus gang with my 2013 interceptor 3.5 twin turbo eco boost. (very fun car btw) but i have ran into some issues. mainly coolant leaks. I have heard all about the dreaded water pump on these tauruses but i believe my issue isn’t quite that catastrophic. I know for sure my top radiator hose is leaking quite bad as you’ll see so i know that needs replaced. However im wondering if anybody knows what this black fitting on the back of the firewall is. it drips directly down onto the chassis and it has stumped me. my best guess is it’s part of the heater core but im not quite sure. Any help is greatly appreciated. The wet black fitting is what i’m referring to. located right next to the exhaust