When the A/C is on it leaks on the passenger side floor?

I have the car listed above LT model. I have water leaking in the passenger side floor only when the A/C is on. I see water from under the car dripping normally too. Still getting water coming in when A/C is on only. I see the pipe in the fire wall. It has a notch at the bottom for the water to drip out. I was wondering there is what seems to be a cap at the end of it. I was wondering if that cap can be removed to help clear out the pipe or is that just part of the pipe? Can I use a sealant on area where pipe goes into the fire wall because the foam or whatever that is seems to be badly cracked?