Personally i would run 3/8 cooler line all the way.
Ive got a set of fittings that screw into the the th400 that are 3/8, i also have a bunch of 3/8 hard line hanging out here.
Just have to bend it. But then you have 3/8 line instead of 5/16, and it looks a hell of a lot better than rubber hose.
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