Hey guys, I've been searching in the forums and can't exactly find what the issue is. A couple of questions that I want need to make sure. As you can see, the yellow circle is where the leak is coming from, but what is that device in the red circle. From what I read on the forums it appears to be a air control valve (ACV) but I'm not exactly sure. Also, if anyone knows what exactly is going on, that will be wonderful.

Situation is this, I've got a leak somewhere and it appears to be that leak in the yellow circle, does anyone know what those pipes are and how this system works exactly?

 

Bump. Anyone?