What Is This Part?

Does anyone recognize the part that is circled in the first pic? It is on the passenger side of the firewall. I found that it is dripping water, a lot of it. Is it supposed to be connected to anything? I know that the AC drips condensation when it is used, but this is a larger puddle than I'm used to seeing. (See second pic) Thanks for the help

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If you're just getting water, then it's working as advertized. Probably just real humid where you are. It will drain any time you use the A/C or defroster.

If you have larger puddle than usual, it's usually because there's something stuck in ither the box or the line that's causing it to drain too slowly. You can CAREFULLY run a coat hanger through the tube to help clean it out. DO NOT POKE A HOLE IN YOUR HEATER CORE.

I've used coat hangers, safety wire on the end of a drill, and long pipe cleaners.