2. There is a breather connection of aluminum pipe about 1.5" long welded to the top of the pipe near the bung for the vacuum. I'm pretty sure most people are going to run without a breather connection. No plug was included. So, I'll have to fashion some kind of plug for that breather tube. It should have just been another bung. A little bigger one of course. But just another bung with a nylon or aluminum plug. Thus, if you did want the breather, put an NPT to hose barb fitting and if not use the plug.