It goes down to a quick connect for air hose. You can put a tee in at that location, with the connector off to the side, and a gate valve straight down so you can purge every now and then to drain water that might trickle down that way.
Ok. Thanks. I am looking at that 165 dollar kit at Northern Tool. It's probably all I would need. It may be a minute before I can get it though, so I hope I can depend on some guidance when I do. Thanks.