96 grand caravan A/C problem

I have 96 Grand Voyager with an A/C problem. The high side port located down by the alternator is leaking. Normally there is a schrader valve there and you replace it and that's it. On mine the low side port is that way , but the high side is not. I have never seen a valve quite like this one. It is not at all like a schrader valve. How do I replace it? You cannot replace it with a schrader valve tool. Can anyone help me with this?

Thank you