Jeremiah

Close however, it's a 9/16-20 "female" adapter that I'm seeking.

It will look something like this.
http://store.fedhillusa.com/ad5br.aspx The 9/16"-20 male inverted flare end, needs to to screw into the port.

I suspect I'll cut the line. I just wanted to make sure I wasn't over looking an existing fitting/adapter.