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Its the one with the blue plastic cap with 'L' on it, the high pressure has a plastic cap with 'H' on it. Low pressure attaches to the back of the compressor and goes to the bulk head, the high pressure is shorter and goes to the rad.
I'll try to dig a pic out too if i can.
Tony
(PS has to be from classic MY97-00, pre97 cars will have a different connector under the plastic cap for filling the system)