A/C Low Pressure Port

I am trying to locate the low pressure port to recharge the A/C on a 02 Taurus. I can only find one port it sticks straight up on the passenger side front of the engine compartment. This looked like the high pressure side to me. Can someone confirm for me ? Thank You

I am trying to locate the low pressure port to recharge the A/C on a 02 Taurus. I can only find one port it sticks straight up on the passenger side front of the engine compartment. This looked like the high pressure side to me. Can someone confirm for me ? Thank You
Strait back from the front one on the firewall