1996 Jimmy A/C

I'm trying to recharge the A/C refrigerant, but I don't know which port to use. Instructions with the R-134 says to use the "low port". Which of these is the low port?

Warning: HUGE photo:

http://www.msu.edu/~schaef60/Random/Jimmy001.jpg (http://www.msu.edu/%7Eschaef60/Random/Jimmy001.jpg)

I can only get the refill can to hook up to the port on the left (the one coming out of the cylinder). Is that the low pressure side?

Yeah, its the one on the left in the picture. That's the accumulator, that its coming off of.