A/C Low-Side Service Port

[vrauba]

Can anybody help me locate, by picture or word description (or both) where I can find the low-side A/C service port? I wan to "top off" my A/C system with R-134A for 2000 Boxster, but I'm having a hard time finding the service port. Is it accessed from underneath? I looked around the compressor, but can't seem to locate it. Is it somewhere else? Is there an extra long hose required to reach the port? Any help or advice would be appreciated. Thanks.

[Tool Pants]

Remove the plastic cover net to the battery on the passenger side. You will see 2 black plastic caps over the valves. I do not know which is which.

[vrauba]

Remove the plastic cover net to the battery on the passenger side.  You will see 2 black plastic caps over the valves.  I do not know which is which.

<{POST_SNAPBACK}>

Thanks. The low pressure service port is the one most over to the right side of the car and is connected to the fatter of the two tubes. R-134A fitting doesn't fit on the high pressure service port, as a safety measure.