Last hose! WOHOOO!!!!1
This is the big one, the #10 discharge hose. Put the grommet on the hose FIRST!
Install a #10 rubber O ring gasket on both ends of the hose and put plenty of the supplied lubricant on them.
Put the hose through the loose firewall cover.
Loosely install the hose onto the underdash unit and A/C compressor. Once you have the hose turned the way you want it, tighten down the fittings on both the A/C compressor and the underdash unit. Again, it's hard to get to the underdash unit, but it can be done