A good solution would be to make a custom block (one big fitting, like 1", make it so there's no where the liquid can go but out the tube, I think Owen's copper cap block would be almost a perfect choice, mounting is up to you) and get a heater core, and tubing. Have the heater core's barb (once again, only one, you'll have to fill the other two) sticking straight out the top, and invert it with the fitting in the top of your case. Run the thick tube between the two, and, well, the vacuum is up to you.
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