After talking on the phone and e-mailing back and forth to Jim Watson at http://www.arc-zone.com/, he is going to put together a Plug n Play TIG water torch connector kit to work with the 250EX and the 300 cooler. I sent him pictures of mine so he knows what is needed. He said he has had several phone calls from people wanting to upgrade to aftermarket torchs.

From one of his e-mails:
I will work with our TIG Product Specialist to come up with a proper TIG torch and connector kit for these machines so people don't have to waste so much time and spend a bunch of money trying to get their new machine set up. . .