Love the professional look and can't wait to get clearance to start hooking everything up.
One question...

What is the big brass thing for? Could you post some pictures or have the page for the enclosure have a link to the installation instructions I can't find. The enclosure looks pretty straight forward but I have no idea what that piece is for... I don't think I need it for my installation but I wanted to make sure I'm not going to be circumventing something by not using it.
Thanks,
I^2