For recharging with R-134a.
Follow the lines off of the compressor,the line that you will need is the line going to the firewall or the filter, the fitting that you are looking for is the small fitting(there are two).The fitting is on the line going to the filter or on the filter itself.If you need furtherassistance just ask or go to advanceautoparts.com and click on their a/c repair video (it's free) and will tell you all you need to know on this repair