Need help - EGR delete

I've done everything with the tune and delete on my 2015 Overland. When I was finished, I had an extra part. I went through HD Diesel supply for my tune and called them, but I don't think they know the JGC setup like they do the Ram. They just told me it's to cap a vacuum hose, but for the life of me, I can't find it. It's a little rubber nipple. Any help would be greatly appreciated.