How to locate the low side port of AC?

I have a 1998 Chevy Prism Lsi. I'm going to recharge the AC for the first time and want to make sure I get the low pressure port.

http://i2.photobucket.com/albums/y28/ykh/acport.jpg

is the circled port the low pressure one?

Thanks!

Anyone? Please.....

its always the one connected closes to the accumulator its the one you got circled

jd-autotech,

Thanks so much for your help!

its always the one connected closes to the accumulator its the one you got circled