Put a ball valve with 3/8 - 3/8 nipples on each side with tubing going to a john guest fitting on each going to the external case... OR
properly drain you equipment for transport like you should, and not worry about it. I drain my setup, then blow into it, to make sure all remaining water in the loop is out. Then drain the leftover. It takes 2 minutes if you have quick fittings on your res.
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