Where is the valve to add a/c refrigerant? on 1998 Chevrolet Lumina

Under the front of the driver side fender.... Laying on the ground, look up.... See that silver colored can type thing?.... The port is on that part! Yep it's a pain in the a..!
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under the air filter box the smaller line is highside and the larger one is lowside the one u add refrigerant to is lowside, just remove the air box with a screwdriver